Census Bureau's annual report on poverty, health insurance and income

The percentage of the nation’s population without health insurance coverage remained stable, at 15.7 percent in 2004. The number of people with health insurance increased by 2.0 million to 245.3 million between 2003 and 2004, and the number without such coverage rose by 800,000 to 45.8 million. These findings are contained in the "Income, Poverty, and Health Insurance Coverage in the United States: 2004" report. http://www.census.gov/prod/2005pubs/p60-229.pdf