According to data from the National Survey on Drug Use and Health (NSDUH), in the Phoenix-Mesa-Glendale (MSA) area, in 2005-2010, a yearly average of 558,000 people 12 or older had used an illicit drug in the past year. This represents 16% of the MSA population and is similar to the rates in Arizona (16.9%) and in the United States as a whole.