| 1 | 2014 | 30.7% | 65.6% | 46.2% | 65.7% | 87.3% | 79.3% | 44.3% | 60.6% | 9.5% | 17.6% | 27.1% |
| 2 | 2013 | 30.3% | 65.5% | 45.9% | 66.5% | 87.0% | 79.4% | 44.2% | 60.2% | 9.4% | 17.5% | 26.9% |
| 3 | 2012 | 30.2% | 64.7% | 45.5% | 66.8% | 87.2% | 79.6% | 44.4% | 59.8% | 9.2% | 17.7% | 26.9% |
| 4 | 2011 | 29.9% | 65.0% | 45.6% | 68.0% | 87.9% | 80.7% | 44.6% | 59.4% | 8.8% | 17.5% | 26.3% |
| 5 | 2005 | 21.5% | 67.7% | 45.9% | 54.7% | 88.2% | 80.8% | 52.7% | 59.1% | 8.8% | 17.1% | 25.9% |
| 6 | 2010 | 28.6% | 64.4% | 45.0% | 66.4% | 88.1% | 80.7% | 45.8% | 58.8% | 8.6% | 17.7% | 26.4% |
| 7 | 2006 | 23.1% | 66.6% | 45.7% | 57.5% | 88.5% | 81.0% | 52.0% | 58.8% | 8.6% | 16.9% | 25.5% |
| 8 | 2007 | 23.7% | 66.0% | 45.5% | 58.8% | 88.2% | 80.7% | 51.5% | 58.7% | 8.7% | 17.0% | 25.7% |
| 9 | 2003 | 22.2% | 68.8% | 46.1% | 52.0% | 87.8% | 79.4% | 51.4% | 58.6% | 9.5% | 16.9% | 26.4% |
| 10 | 2008 | 24.9% | 65.4% | 45.4% | 61.5% | 87.9% | 80.7% | 50.5% | 58.6% | 8.7% | 17.1% | 25.7% |
| 11 | 2004 | 20.5% | 69.0% | 45.6% | 61.6% | 85.1% | 80.0% | 51.7% | 58.4% | 9.1% | 16.9% | 25.9% |
| 12 | 2002 | 18.1% | 70.0% | 46.3% | 49.7% | 85.5% | 79.1% | 54.2% | 58.3% | 9.6% | 16.4% | 26.0% |
| 13 | 2009 | 24.9% | 66.0% | 44.9% | 62.0% | 87.8% | 80.4% | 48.7% | 58.2% | 8.7% | 17.5% | 26.2% |