Health United States 2020-2021

Average annual rate of change (percent change)

In Health, United States, average annual rates of change, or growth rates, are calculated as:

[(Pn/P0)1/N -1]×100


Pn = later time period
Po = earlier time period
N = number of years in interval.

This geometric rate of change assumes that a variable increases or decreases at the same rate during each year between the two time periods.