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USA Center for Disease Control:

http://www.cdc.gov/nchhstp/newsroom/HIVFactSheets/Progress/Trends.htm

from that link: (my bold & underlining)

"The nation's investment in HIV prevention has contributed to dramatic reductions in the annual number of new infections since the peak of the epidemic in the mid-1980s, and an overall stabilization of new infections since the mid-1990s (from roughly 130,000 new infections to approximately 50,000 annually).7,8 While new infections per year continue at too high a level, this stabilization is in itself a sign of progress. With continued increases in the number of people living with HIV thanks to effective HIV medications, there are more opportunities for HIV transmission than ever before.9 Yet, the annual number of new infections has not increased, indicating that HIV testing, prevention, and treatment programs are effectively reducing the rate of transmission overall. Declines in new infections have also been documented in several key populations over time, underscoring the impact and importance of concentrated prevention efforts: