"• In 2013, 2.5 million persons (0.9 percent of persons aged 12 or older and 10.9 percent of those who needed treatment) received treatment at a specialty facility for an illicit drug or alcohol problem. The number in 2013 was similar to the numbers in 2002 (2.3 million) and in 2004 through 2012 (ranging from 2.3 million to 2.6 million), and it was higher than the number in 2003 (1.9 million). The rate in 2013 was not different from the rates in 2002 to 2012 (ranging from 0.8 to 1.0 percent).
"• In 2013, 20.2 million persons (7.7 percent of the population aged 12 or older) needed treatment for an illicit drug or alcohol use problem but did not receive treatment at a specialty facility in the past year. The number in 2013 was similar to the numbers in 2002 to 2012 (ranging from 19.3 million to 21.1 million). The rate in 2013 was similar to the rates in 2010 to 2012 (ranging from 7.5 to 8.1 percent), but it was lower than the rates in 2002 to 2009 (ranging from 8.3 to 8.8 percent).
"• Of the 2.5 million persons aged 12 or older who received specialty substance use treatment in 2013, 875,000 received treatment for alcohol use only, 936,000 received treatment for illicit drug use only, and 547,000 received treatment for both alcohol and illicit drug use. These estimates in 2013 were similar to the estimates in 2012 and 2002."

Source

Substance Abuse and Mental Health Services Administration, Results from the 2013 National Survey on Drug Use and Health: Summary of National Findings, NSDUH Series H-48, HHS Publication No. (SMA) 14-4863. Rockville, MD: Substance Abuse and Mental Health Services Administration, 2014, p. 93.
http://www.samhsa.gov/data/NS…
http://www.samhsa.gov/data/NS…