Silver Book Fact
In 2007, the Medicare program had about 44 million enrollees and expenditures of $432 billion, up from $408 billion the previous year. Expenditures for the new Medicare drug program (Part D), introduced in 2006, were $50 billion in 2007 (preliminary data).
Centers for Disease Control and Prevention. Health, United States, 2008. Hyattsville, MD: National Center for Health Statistics; http://www.cdc.gov/nchs/data/hus/hus08.pdf