| Year | U.S. adults |
|---|---|
| 2000 | 52% |
| 2001 | 55% |
| 2002 | 59% |
| 2003 | 61% |
| 2004 | 63% |
| 2005 | 68% |
| 2006 | 71% |
| 2007 | 74% |
| 2008 | 74% |
| 2009 | 76% |
| 2010 | 76% |
| 2011 | 79% |
| 2012 | 83% |
| 2013 | 84% |
| 2014 | 84% |
| 2015 | 86% |
| 2016 | 88% |
| 2018 | 89% |
| 2019 | 90% |
| 2021 | 93% |
- Report
|
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