Data are from CDC’s National HIV Behavioral Surveillance System—a project that monitors HIV risk, exposure to HIV prevention and HIV prevalence in gay, bisexual and other MSM, injecting drug users, and high-risk heterosexuals in urban areas that have been most heavily affected by the epidemic. The report that these data come from can be found at:

http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6031a1.htm?s_cid=mm6031a1_e