It is possible that that data you are looking for has not been collected, or it has not been analyzed in the manner in which you need. You may need to obtain the original data and perform your own analysis. This will be easier if the data was gathered by a government agency, in which case you can the data may be available upon request, in a library, or for purchase. However, if the data was originally compiled by a private organization, it may not be impossible to obtain the original data sets. Fourth, data collection and analysis at a national level takes time to compile.
Most statistics are out of date to some degree by the time they are published.
Just because a report is published in 2000 does not mean the data is from the most recent few years. Current health data is often based on extrapolations of older data, such as U.S. Census data, compiled every ten years, or smaller sample sizes. Again, check to see when and how the data was collected. In most cases you will probably see at least a 3-5 year time lag between data collection and a published report. Most health data is compiled and distributed by the federal government.