The CDC publishes HIV surveillance reports that include incidence (new infections) and prevalence (people living with diagnosed cases) data. These graphs show prevalence data based on estimates of the 2010 population diagnosed with HIV. The data include all stages of the disease; stage 3 is commonly known as AIDS. According to the CDC, as many as one in six people with HIV are unaware that they are infected. As such, the prevalence data, which include only diagnosed cases, slightly underestimate the actual rates of infection.

Data source: http://www.cdc.gov/hiv/pdf/statistics_2011_HIV_Surveillance_Report_vol_23.pdf (Table 17a)