“Persons dependent on or abusing a substance in the past 12 months, or who received specialty treatment for a substance use problem within the past 12 months, are classified as needing treatment. In 2004, the number of persons aged 12 or older needing treatment for an alcohol or illicit drug use problem was 23.48 million (9.8 percent). Of these, 2.33 million received treatment at a specialty facility in the past year. Thus, 21.15 million people needed but did not receive treatment at a specialty facility in 2004. The number needing but not receiving treatment did not change significantly from 2002 to 2004.”