| Year | Republicans | Democrats | Independents |
|---|---|---|---|
| 2001 | 21% | 43% | 43% |
| 2003 | 22% | 43% | 40% |
| 2004 | 17% | 40% | 37% |
| 2005 | 19% | 45% | 46% |
| 2006 | 17% | 43% | 44% |
| 2007 | 18% | 48% | 40% |
| 2008 | 19% | 50% | 44% |
| 2009 | 19% | 50% | 39% |
| 2010 | 24% | 53% | 46% |
| 2011 | 27% | 56% | 51% |
| 2012 | 25% | 62% | 52% |
| 2013 | 29% | 59% | 57% |
| 2014 | 30% | 64% | 58% |
| 2015 | 32% | 66% | 61% |
| 2016 | 33% | 70% | 61% |
| 2017 | 40% | 73% | 70% |
- Report
|
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