| Year | College graduate or more | Some college / Associate degree | High school graduate or less |
|---|---|---|---|
| 2005 | 12 | 8 | 4 |
| 2006 | 9 | 17 | 9 |
| 2008 | 29 | 32 | 20 |
| 2009 | 49 | 47 | 28 |
| 2010 | 56 | 55 | 35 |
| 2011 | 61 | 61 | 39 |
| 2012 | 65 | 65 | 44 |
| 2013 | 72 | 69 | 51 |
| 2014 | 69 | 71 | 50 |
| 2015 | 76 | 70 | 54 |
Source: Pew Research Center surveys, 2005-2006, 2008-2015. No data are available for 2007.
