Workers' Memorial Day, observed each year on April 28, was established to recognize workers who died or were injured on the job. In 2006, 5,840 workers in the United States died from injuries sustained at work; an estimated 49,000 annual deaths have been attributed to work-related diseases. In 2006, an estimated 4.1 million private-sector workers had a nonfatal work-related injury or illness; approximately half of these workers required a job transfer, work restrictions, or time away from their jobs. An estimated 3.4 million workers were treated in emergency departments in 2004 because of occupational injuries, and approximately 80,000 were hospitalized. In 2005, workers' compensation costs for employers totaled an estimated $89 billion.