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Response rates and sample size of the NSDUH survey by year of collection.
| Year | Study Sample Size | Response Rate |
|---|---|---|
| 2005 | 55,905 | 91% |
| 2006 | 55,035 | 90% |
| 2007 | 55,049 | 89% |
| 2008 | 55,110 | 89% |
| 2009 | 55,234 | 88% |
| 2010 | 57,313 | 88% |
| 2011 | 58,397 | 87% |
| 2012 | 55,268 | 86% |
| 2013 | 55,160 | 84% |
| 2014 | 55,271 | 82% |
