| Year | Favor | Oppose |
|---|---|---|
| 2001 | 35% | 57% |
| 2003 | 32% | 59% |
| 2004 | 31% | 60% |
| 2005 | 36% | 53% |
| 2006 | 35% | 55% |
| 2007 | 37% | 54% |
| 2008 | 39% | 51% |
| 2009 | 37% | 54% |
| 2010 | 42% | 48% |
| 2011 | 46% | 45% |
| 2012 | 48% | 43% |
| 2013 | 50% | 43% |
| 2014 | 52% | 40% |
| 2015 | 55% | 39% |
| 2016 | 55% | 37% |
| 2017 | 62% | 32% |
- Report
|
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