| U.S. adults | |
|---|---|
| 3/21/2005 | 5% |
| 12/8/2005 | 8% |
| 8/31/2006 | 11% |
| 5/11/2008 | 21% |
| 8/10/2008 | 26% |
| 8/31/2008 | 25% |
| 12/4/2008 | 27% |
| 12/20/2008 | 26% |
| 4/19/2009 | 36% |
| 9/14/2009 | 37% |
| 12/27/2009 | 42% |
| 1/19/2010 | 43% |
| 5/30/2010 | 48% |
| 9/13/2010 | 46% |
| 11/24/2010 | 45% |
| 11/28/2010 | 46% |
| 12/21/2010 | 47% |
| 5/22/2011 | 50% |
| 8/26/2011 | 50% |
| 2/19/2012 | 53% |
| 8/7/2012 | 59% |
| 12/9/2012 | 54% |
| 5/19/2013 | 61% |
| 7/14/2013 | 60% |
| 9/30/2013 | 63% |
| 1/26/2014 | 62% |
| 7/12/2015 | 65% |
| 11/6/2016 | 69% |
| 1/10/2018 | 69% |
| 2/7/2019 | 72% |
| 2/8/2021 | 72% |
- Report
|
