NOTE: The uninsured category represents people who were uninsured during all of the relevant calendar year. SOURCE: Data are from U.S. Census Bureau and Bureau of Labor Statistics, 1988 to 2008a. NOTES: Respondents were not asked detailed health insurance questions before the 1988 Current Population Survey. For information on recessions, see Appendix A of the 2008 Current Population Survey. The uninsured category represents people who were uninsured during all of the relevant calendar year. 1 The data for 1996 through 2003 were revised using an approximation method for consistency with the revision to the 2004 and 2005 estimates. 2 Implementation of Census 2000 based population controls occurred for the 2000 Annual Social and Economic Supplement, which collected data for 1999. These estimates also reflect the results of follow-up verification questions that were asked of people who responded "no" to all questions about specific types of health insurance coverage in order to verify whether they were actually uninsured. This change increased the number and percentage of people covered by health insurance, bringing the Current Population Survey more in line with estimates from other national surveys.