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2007 ART Section 5 ART Trends 1998–2007

Explanation of Figures 49–64. Click on titles or images to go back to Section 5.


Figure 49 is a line graph with three lines, one line represents the number of ART cycles performed, one line represents the number of live-birth deliveries, and one line represents the number of infants born using ART, by year from 1998 to 2007.

  • 1998: 81,438 ART cycles, 20,126 live-birth deliveries, 28,851 infants born.
  • 1999: 87,636 ART cycles, 21,746 live-birth deliveries, 30,629 infants born.
  • 2000: 99,629 ART cycles, 25,228 live-birth deliveries, 35,025 infants born.
  • 2001: 107,587 ART cycles, 29,344 live-birth deliveries, 40,687 infants born.
  • 2002: 115,392 ART cycles, 33,141 live-birth deliveries, 45,751 infants born.
  • 2003: 122,872 ART cycles, 35,785 live-birth deliveries, 48,756 infants born.
  • 2004: 127,977 ART cycles, 36,760 live-birth deliveries, 49,458 infants born.
  • 2005: 134,260 ART cycles, 38,910 live-birth deliveries, 52,041 infants born.
  • 2006: 138,198 ART cycles, 41,343 live-birth deliveries, 54,656 infants born.
  • 2007: 142,435 ART cycles, 43,412 live-birth deliveries, 57,569 infants born.
Figure 50: See text below

Figure 50 is a line graph with three lines representing the numbers of ART cycles using fresh or frozen nondonor eggs or embryos, by ICSI (intracytoplasmic sperm injection), by year from 1998 to 2007.

  • 1998: Fresh–nondonor without ICSI 37,432 cycles, Fresh–nondonor with ICSI 24,612 cycles, Frozen–nondonor 11,407 cycles.
  • 1999: Fresh–nondonor without ICSI 38,033 cycles, Fresh–nondonor with ICSI 28,090 cycles, Frozen–nondonor 12,178 cycles.
  • 2000: Fresh–nondonor without ICSI 40,368 cycles, Fresh–nondonor with ICSI 35,148 cycles, Frozen–nondonor 13,312 cycles.
  • 2001: Fresh–nondonor without ICSI 40,432 cycles, Fresh–nondonor with ICSI 40,432 cycles, Frozen–nondonor 14,705 cycles.
  • 2002: Fresh–nondonor without ICSI 40,215 cycles, Fresh–nondonor with ICSI 45,611 cycles, Frozen–nondonor 16,383 cycles.
  • 2003: Fresh–nondonor without ICSI 40,160 cycles, Fresh–nondonor with ICSI 50,872 cycles, Frozen–nondonor 17,517 cycles.
  • 2004: Fresh–nondonor without ICSI 39,966 cycles, Fresh–nondonor with ICSI 54,276 cycles, Frozen–nondonor 18,560 cycles.
  • 2005: Fresh–nondonor without ICSI 39,249 cycles, Fresh–nondonor with ICSI 58,193 cycles, Frozen–nondonor 20,657 cycles.
  • 2006: Fresh–nondonor without ICSI 37,364 cycles, Fresh–nondonor with ICSI 61,835 cycles, Frozen–nondonor 22,023 cycles.
  • 2007: Fresh–nondonor without ICSI 37,268 cycles, Fresh–nondonor with ICSI 64,629 cycles, Frozen–nondonor 23,133 cycles.

Figure 51 is a line graph with three lines representing the numbers of ART cycles using fresh or frozen donor eggs or embryos, by ICSI (intracytoplasmic sperm injection), and by year from 1998 to 2007.

  • 1998: Fresh–donor without ICSI 3,957 cycles, Fresh–donor with ICSI 2,031 cycles, Frozen–donor 1,999 cycles.
  • 1999: Fresh–donor without ICSI 4,107 cycles, Fresh–donor with ICSI 2,623 cycles, Frozen–donor 2,605 cycles.
  • 2000: Fresh–donor without ICSI 4,452 cycles, Fresh–donor with ICSI 3,467 cycles, Frozen–donor 2,882 cycles.
  • 2001: Fresh–donor without ICSI 4,333 cycles, Fresh–donor with ICSI 4,259 cycles, Frozen–donor 3,426 cycles.
  • 2002: Fresh–donor without ICSI 4,342 cycles, Fresh–donor with ICSI 4,919 cycles, Frozen–donor 3,922 cycles.
  • 2003: Fresh–donor without ICSI 4,294 cycles, Fresh–donor with ICSI 5,565 cycles, Frozen–donor 4,464 cycles.
  • 2004: Fresh–donor without ICSI 4,309 cycles, Fresh–donor with ICSI 5,947 cycles, Frozen–donor 4,919 cycles.
  • 2005: Fresh–donor without ICSI 4,244 cycles, Fresh–donor with ICSI 6,376 cycles, Frozen–donor 5,541 cycles.
  • 2006: Fresh–donor without ICSI 3,945 cycles, Fresh–donor with ICSI 7,039 cycles, Frozen–donor 5,992 cycles.
  • 2007: Fresh–donor without ICSI 3,775 cycles, Fresh–donor with ICSI 7,500 cycles, Frozen–donor 6,130 cycles.

Figure 52 is a line graph with three lines representing the percentages of transfers that resulted in live births using fresh or frozen nondonor eggs or embryos, by ICSI (intracytoplasmic sperm injection), and by year from 1998 to 2007.

  • 1998: Fresh–nondonor without ICSI 31.8%, Fresh–nondonor with ICSI 29.8%, Frozen–nondonor 19.4%.
  • 1999: Fresh–nondonor without ICSI 32.5%, Fresh–nondonor with ICSI 30.1%, Frozen–nondonor 18.6%.
  • 2000: Fresh–nondonor without ICSI 33.2%, Fresh–nondonor with ICSI 30.3%, Frozen–nondonor 20.3%.
  • 2001: Fresh–nondonor without ICSI 34.9%, Fresh–nondonor with ICSI 32.3%, Frozen–nondonor 23.4%.
  • 2002: Fresh–nondonor without ICSI 36.5%, Fresh–nondonor with ICSI 33.8%, Frozen–nondonor 24.8%.
  • 2003: Fresh–nondonor without ICSI 36.2%, Fresh–nondonor with ICSI 33.9%, Frozen–nondonor 27.0%.
  • 2004: Fresh–nondonor without ICSI 35.9%, Fresh–nondonor with ICSI 33.1%, Frozen–nondonor 27.7%.
  • 2005: Fresh–nondonor without ICSI 36.1%, Fresh–nondonor with ICSI 33.5%, Frozen–nondonor 28.0%.
  • 2006: Fresh–nondonor without ICSI 37.2%, Fresh–nondonor with ICSI 34.6%, Frozen–nondonor 28.9%.
  • 2007: Fresh–nondonor without ICSI 37.2%, Fresh–nondonor with ICSI 35.4%, Frozen–nondonor 29.9%.

Figure 53 is a line graph with three lines representing the percentages of transfers that resulted in live births using fresh or frozen donor eggs or embryos,  by ICSI (intracytoplasmic sperm injection), and by year from 1998 to 2007.

  • 1998: Fresh–donor without ICSI 42.1%, Fresh–donor with ICSI 38.6%, Frozen–donor 23.3%.
  • 1999: Fresh–donor without ICSI 43.3%, Fresh–donor with ICSI 39.5%, Frozen–donor 24.0%.
  • 2000: Fresh–donor without ICSI 45.4%, Fresh–donor with ICSI 41.5%, Frozen–donor 23.9%.
  • 2001: Fresh–donor without ICSI 48.8%, Fresh–donor with ICSI 45.5%, Frozen–donor 27.3%.
  • 2002: Fresh–donor without ICSI 52.9%, Fresh–donor with ICSI 47.8%, Frozen–donor 28.8%.
  • 2003: Fresh–donor without ICSI 52.1%, Fresh–donor with ICSI 49.9%, Frozen–donor 30.1%.
  • 2004: Fresh–donor without ICSI 53.3%, Fresh–donor with ICSI 48.8%, Frozen–donor 30.5%.
  • 2005: Fresh–donor without ICSI 54.5%, Fresh–donor with ICSI 51.0%, Frozen–donor 30.9%.
  • 2006: Fresh–donor without ICSI 55.6%, Fresh–donor with ICSI 52.8%, Frozen–donor 32.1%.
  • 2007: Fresh–donor without ICSI 56.3%, Fresh–donor with ICSI 54.7%, Frozen–donor 31.9%.

Figure 54 is a line graph with three lines representing the percentages of transfers that resulted in singleton live births using fresh or frozen nondonor eggs or embryos, by ICSI (intracytoplasmic sperm injection), and by year from 1998 to 2007.

  • 1998: Fresh–nondonor without ICSI 19.1%, Fresh–nondonor with ICSI 19.1%, Frozen–nondonor 14.1%.
  • 1999: Fresh–nondonor without ICSI 20.0%, Fresh–nondonor with ICSI 19.4%, Frozen–nondonor 13.5%.
  • 2000: Fresh–nondonor without ICSI 21.2%, Fresh–nondonor with ICSI 19.9%, Frozen–nondonor 15.1%.
  • 2001: Fresh–nondonor without ICSI 21.7%, Fresh–nondonor with ICSI 21.2%, Frozen–nondonor 17.2%.
  • 2002: Fresh–nondonor without ICSI 23.2%, Fresh–nondonor with ICSI 22.1%, Frozen–nondonor 18.7%.
  • 2003: Fresh–nondonor without ICSI 23.2%, Fresh–nondonor with ICSI 22.7%, Frozen–nondonor 20.2%.
  • 2004: Fresh–nondonor without ICSI 23.6%, Fresh–nondonor with ICSI 22.6%, Frozen–nondonor 21.0%.
  • 2005: Fresh–nondonor without ICSI 24.0%, Fresh–nondonor with ICSI 23.0%, Frozen–nondonor 21.7%.
  • 2006: Fresh–nondonor without ICSI 25.3%, Fresh–nondonor with ICSI 24.2%, Frozen–nondonor 21.9%.
  • 2007: Fresh–nondonor without ICSI 25.4%, Fresh–nondonor with ICSI 24.4%, Frozen–nondonor 22.7%.

Figure 55 is a line graph with three lines representing the percentages of transfers that resulted in singleton live births using fresh or frozen donor eggs or embryos, by ICSI (intracytoplasmic sperm injection), and by year from 1998 to 2007.

  • 1998: Fresh–donor without ICSI 23.0%, Fresh–donor with ICSI 22.7%, Frozen–donor 16.8%.
  • 1999: Fresh–donor without ICSI 24.9%, Fresh–donor with ICSI 23.5%, Frozen–donor 16.7%.
  • 2000: Fresh–donor without ICSI 26.1%, Fresh–donor with ICSI 25.6%, Frozen–donor 16.9%.
  • 2001: Fresh–donor without ICSI 28.4%, Fresh–donor with ICSI 26.6%, Frozen–donor 19.6%.
  • 2002: Fresh–donor without ICSI 29.1%, Fresh–donor with ICSI 28.5%, Frozen–donor 20.9%.
  • 2003: Fresh–donor without ICSI 30.2%, Fresh–donor with ICSI 30.4%, Frozen–donor 22.3%.
  • 2004: Fresh–donor without ICSI 30.4%, Fresh–donor with ICSI 30.2%, Frozen–donor 22.5%.
  • 2005: Fresh–donor without ICSI 31.5%, Fresh–donor with ICSI 30.6%, Frozen–donor 22.6%.
  • 2006: Fresh–donor without ICSI 32.8%, Fresh–donor with ICSI 32.7%, Frozen–donor 24.3%.
  • 2007: Fresh–donor without ICSI 33.1%, Fresh–donor with ICSI 32.8%, Frozen–donor 24.3%.

Figure 56 is a line graph with five lines representing percentages of transfers that resulted in live births for ART cycles using fresh nondonor eggs or embryos, by woman’s age, and by year from 1998 to 2007. 

  • 1998: Age <35, 37.4%; Age 35–37, 31.9%; Age 38–40, 23.6%; Age 41–42, 14.1%; Age >42, 6.9%
  • 1999: Age <35, 37.8%; Age 35–37, 32.4%; Age 38–40, 24.2%; Age 41–42, 13.6%; Age >42, 7.2%
  • 2000: Age <35, 38.4%; Age 35–37, 33.0%; Age 38–40, 24.3%; Age 41–42, 14.3%; Age >42, 6.0%
  • 2001: Age <35, 41.1%; Age 35–37, 35.1%; Age 38–40, 25.4%; Age 41–42, 14.5%; Age >42, 6.7%
  • 2002: Age <35, 43.0%; Age 35–37, 37.1%; Age 38–40, 26.4%; Age 41–42, 14.7%; Age >42, 6.6%
  • 2003: Age <35, 43.2%; Age 35–37, 36.6%; Age 38–40, 26.1%; Age 41–42, 15.1%; Age >42, 5.9%
  • 2004: Age <35, 42.7%; Age 35–37, 35.5%; Age 38–40, 25.3%; Age 41–42, 14.8%; Age >42, 6.1%
  • 2005: Age <35, 43.4%; Age 35–37, 35.9%; Age 38–40, 25.4%; Age 41–42, 14.9%; Age >42, 5.8%
  • 2006: Age <35, 44.7%; Age 35–37, 37.1%; Age 38–40, 26.7%; Age 41–42, 15.1%; Age >42, 6.6%,  Note: 2006 was the last year in which data were reported together for women older than 42.
  • 2007: Age <35, 45.9%; Age 35–37, 36.9%; Age 38–40, 27.1%; Age 41–42, 16.0%; Age 43–44, 8.4%; Age >44, 3.2%,  Note: 2007 was the first year in which data for women older than 42 were subdivided into ages 43–44 and >44.

Figure 57 is a line graph with five lines representing percentages of transfers that resulted in singleton live births for ART cycles using fresh nondonor eggs or embryos, by woman’s age, and by year from 1998 to 2007. 

  • 1998: Age <35, 21.5%; Age 35–37, 20.1%; Age 38–40, 16.9%; Age 41–42, 11.4%; Age >42, 5.9%
  • 1999: Age <35, 22.3%; Age 35–37, 20.8%; Age 38–40, 17.3%; Age 41–42, 11.6%; Age >42, 6.3%
  • 2000: Age <35, 23.6%; Age 35–37, 21.3%; Age 38–40, 17.7%; Age 41–42, 11.8%; Age >42, 5.3%
  • 2001: Age <35, 24.8%; Age 35–37, 22.9%; Age 38–40, 18.5%; Age 41–42, 11.9%; Age >42, 5.8%
  • 2002: Age <35, 26.3%; Age 35–37, 24.0%; Age 38–40, 19.3%; Age 41–42, 11.9%; Age >42, 6.2%
  • 2003: Age <35, 26.6%; Age 35–37, 24.8%; Age 38–40, 19.3%; Age 41–42, 12.4%; Age >42, 5.3%
  • 2004: Age <35, 27.3%; Age 35–37, 24.3%; Age 38–40, 19.0%; Age 41–42, 12.3%; Age >42, 5.6%
  • 2005: Age <35, 27.9%; Age 35–37, 24.9%; Age 38–40, 19.0%; Age 41–42, 12.7%; Age >42, 5.1%
  • 2006: Age <35, 29.3%; Age 35–37, 26.0%; Age 38–40, 20.7%; Age 41–42, 12.7%; Age >42, 6.0%,  Note: 2006 was the last year in which data were reported together for women older than 42.
  • 2007: Age <35, 29.9%; Age 35–37, 25.7%; Age 38–40, 20.6%; Age 41–42, 13.6%; Age 43–44, 7.7%; Age >44, 2.8%,  Note: 2007 was the first year in which data for women older than 42 were subdivided into ages 43–44 and >44.

Figure 58 is a bar graph representing the percentages of fresh–nondonor cycles that involved the transfer of one, two, three, or four or more embryos, by year from 1998 to 2007.  Note: Totals do not all equal 100% due to rounding.

  • 1998: One, 5%; Two, 15%; Three, 33%; Four or more, 46%
  • 1999: One, 6%; Two, 23%; Three, 34%; Four or more, 36%
  • 2000: One, 6%; Two, 26%; Three, 35%; Four or more, 34%
  • 2001: One, 6%; Two, 27%; Three, 35%; Four or more, 32%
  • 2002: One, 7%; Two, 32%; Three, 34%; Four or more, 28%
  • 2003: One, 7%; Two, 36%; Three, 33%; Four or more, 24%
  • 2004: One, 8%; Two, 39%; Three, 32%; Four or more, 21%
  • 2005: One, 9%; Two, 43%; Three, 29%; Four or more, 18%
  • 2006: One, 11%; Two, 46%; Three, 28%; Four or more, 16%
  • 2007: One, 12%; Two, 48%; Three, 26%; Four or more, 14%

Figure 59 is a bar graph representing the percentages of fresh–nondonor cycles that involved the transfer of one, two, three, or four or more embryos in women who were younger than 35 and set aside extra embryos for future use, by year from 1998 to 2007. Note: For years 1998, 2000, and 2001, cycles involving the transfer of one embryo were not included because of the small number of cycles where one embryo was transferred and extra embryos were set aside for future use.  Totals do not all equal 100% due to rounding.

  • 1998: Two, 16%; Three, 50%; Four or more, 33%
  • 1999: One, 1%; Two, 35%; Three, 45%; Four or more, 19%
  • 2000: Two, 45%; Three, 40%; Four or more, 15%
  • 2001: Two, 48%; Three, 39%; Four or more, 12%
  • 2002: One, 1%; Two, 55%; Three, 35%; Four or more, 9%
  • 2003: One, 2%; Two, 62%; Three, 29%; Four or more, 7%
  • 2004: One, 3%; Two, 68%; Three, 25%; Four or more, 5%
  • 2005: One, 4%; Two, 72%; Three, 20%; Four or more, 4%
  • 2006: One, 7%; Two, 75%; Three, 16%; Four or more, 3%
  • 2007: One, 9%; Two, 76%; Three, 13%; Four or more, 2%

Figure 60 is a line graph with four lines representing percentages of transfers that resulted in live births using fresh nondonor eggs or embryos, by number of embryos transferred, and by year from 1998 to 2007.

  • 1998: One, 8.0%; Two, 26.1%; Three, 35.8%; Four or more, 31.7%
  • 1999: One, 11.5%; Two, 30.9%; Three, 35.4%; Four or more, 31.2%
  • 2000: One, 9.8%; Two, 34.8%; Three, 34.9%; Four or more, 29.6%
  • 2001: One, 11.3%; Two, 37.2%; Three, 36.7%; Four or more, 30.9%
  • 2002: One, 12.8%; Two, 39.5%; Three, 37.7%; Four or more, 31.4%
  • 2003: One, 13.2%; Two, 40.2%; Three, 36.9%; Four or more, 30.1%
  • 2004: One, 13.7%; Two, 40.0%; Three, 35.4%; Four or more, 28.8%
  • 2005: One, 16.7%; Two, 40.9%; Three, 34.3%; Four or more, 27.6%
  • 2006: One, 18.8%; Two, 41.9%; Three, 35.1%; Four or more, 27.9%
  • 2007: One, 20.8%; Two, 42.6%; Three, 34.8%; Four or more, 27.8%

Figure 61 is a line graph with four lines representing percentages of transfers that resulted in live births among women who were younger than 35 and set aside extra embryos for future use, by number of embryos transferred, and by year from 1998 to 2007. Note: For years 1998 through 2000, cycles involving the transfer of one embryo were not included because of the small number of cycles where one embryo was transferred and extra embryos were set aside for future use.

  • 1998: Two, 46.4%; Three, 47.0%; Four or more, 42.0%
  • 1999: Two, 46.5%; Three, 47.3%; Four or more, 41.4%
  • 2000: Two, 49.8%; Three, 44.8%; Four or more, 39.1%
  • 2001: One, 30.0%; Two, 51.7%; Three, 46.9%; Four or more, 42.9%
  • 2002: One, 47.4%; Two, 51.8%; Three, 49.5%; Four or more, 45.5%
  • 2003: One, 39.5%; Two, 53.3%; Three, 49.2%; Four or more, 46.5%
  • 2004: One, 45.3%; Two, 52.7%; Three, 49.8%; Four or more, 46.8%
  • 2005: One, 43.3%; Two, 52.8%; Three, 47.5%; Four or more, 45.1%
  • 2006: One, 48.5%; Two, 54.5%; Three, 49.6%; Four or more, 42.8%
  • 2007: One, 50.2%; Two, 55.9%; Three, 50.1%; Four or more, 40.6%

Figure 62 is a line graph with four lines representing percentages of ART cycles that resulted in multiple-infant live births, by type of ART cycle, and by year from 1998 to 2007.

  • 1998: Fresh–nondonor 38.2%, Frozen–nondonor 27.1%, Fresh–donor 43.9%, Frozen–donor 27.9%
  • 1999: Fresh–nondonor 37.0%, Frozen–nondonor 27.1%, Fresh–donor 41.8%, Frozen–donor 30.4%
  • 2000: Fresh–nondonor 35.3%, Frozen–nondonor 25.8%, Fresh–donor 40.6%, Frozen–donor 29.1%
  • 2001: Fresh–nondonor 35.8%, Frozen–nondonor 26.8%, Fresh–donor 41.7%, Frozen–donor 28.4%
  • 2002: Fresh–nondonor 35.4%, Frozen–nondonor 24.6%, Fresh–donor 42.4%, Frozen–donor 27.3%
  • 2003: Fresh–nondonor 34.2%, Frozen–nondonor 25.3%, Fresh–donor 40.3%, Frozen–donor 26.0%
  • 2004: Fresh–nondonor 32.5%, Frozen–nondonor 24.2%, Fresh–donor 40.0%, Frozen–donor 26.2%
  • 2005: Fresh–nondonor 32.0%, Frozen–nondonor 22.7%, Fresh–donor 40.8%, Frozen–donor 27.1%
  • 2006: Fresh–nondonor 30.7%, Frozen–nondonor 24.2%, Fresh–donor 39.1%, Frozen–donor 24.2%
  • 2007: Fresh–nondonor 31.3%, Frozen–nondonor 24.1%, Fresh–donor 40.3%, Frozen–donor 23.9%

Figure 63 is a line graph with five lines representing percentages of multiple-infant live births for ART cycles using fresh nondonor eggs or embryos by ART patient’s age, and by year from 1998 to 2007.

  • 1998: Age <35, 42.4%; Age 35–37, 37.0%; Age 38–40, 28.4%; Age 41–42, 19.7%; Age >42, 15.0%
  • 1999: Age <35, 41.1%; Age 35–37, 35.8%; Age 38–40, 28.5%; Age 41–42, 14.5%; Age >42, 12.2%
  • 2000: Age <35, 38.6%; Age 35–37, 35.3%; Age 38–40, 27.2%; Age 41–42, 17.6%; Age >42, 12.2%
  • 2001: Age <35, 39.7%; Age 35–37, 34.7%; Age 38–40, 27.2%; Age 41–42, 17.9%; Age >42, 14.4%
  • 2002: Age <35, 38.9%; Age 35–37, 35.4%; Age 38–40, 26.9%; Age 41–42, 18.6%; Age >42, 6.5%
  • 2003: Age <35, 38.4%; Age 35–37, 32.1%; Age 38–40, 26.1%; Age 41–42, 17.4%; Age >42, 10.2%
  • 2004: Age <35, 36.1%; Age 35–37, 31.5%; Age 38–40, 24.9%; Age 41–42, 16.8%; Age >42, 8.2%
  • 2005: Age <35, 35.6%; Age 35–37, 30.9%; Age 38–40, 25.1%; Age 41–42, 14.5%; Age >42, 12.8%
  • 2006: Age <35, 34.4%; Age 35–37, 29.8%; Age 38–40, 22.6%; Age 41–42, 15.4%; Age >42, 9.4%.  Note: 2006 was the last year in which data were reported together for women older than 42.
  • 2007: Age <35, 34.9%; Age 35–37, 30.4%; Age 38–40, 23.9%; Age 41–42, 15.4%; Age 43-44, 8.9; Age >44, 13%. Note: 2007 was the first year in which data for women older than 42 were subdivided into ages 43-44 and >44.

Figure 64 is a bar graph representing percentages of transfers that resulted in live births and percentages of multiple-infant live births for ART cycles using fresh nondonor eggs or embryos, by year from 1998 to 2007.  

  • 1998: Percentage of live births, 30.9%. Of these live births, 62% were singletons, 32% were twins, and 6% were triplets or more. 
  • 1999: Percentage of live births, 31.3%. Of these live births, 63% were singletons, 32% were twins, and 5% were triplets or more. 
  • 2000: Percentage of live births, 31.6%. Of these live births, 65% were singletons, 31% were twins, and 4% were triplets or more. 
  • 2001: Percentage of live births, 33.4%. Of these live births, 64% were singletons, 32% were twins, and 4% were triplets or more.
  • 2002: Percentage of live births, 34.8%. Of these live births, 65% were singletons, 32% were twins, and 4% were triplets or more. Note: Total does not equal 100% due to rounding.
  • 2003: Percentage of live births, 34.7%. Of these live births, 66% were singletons, 31% were twins, and 3% were triplets or more.
  • 2004: Percentage of live births, 34.1%. Of these live births, 67% were singletons, 30% were twins, and 3% were triplets or more.
  • 2005: Percentage of live births, 34.3%. Of these live births, 68% were singletons, 30% were twins, and 2% were triplets or more.
  • 2006: Percentage of live births, 35.4%. Of these live births, 69% were singletons, 29% were twins, and 2% were triplets or more.
  • 2007: Percentage of live births, 35.9%. Of these live births, 69% were singletons, 29% were twins, and 2% were triplets or more.
 
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