| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 32 | 2 | 94.12 |
| 2009 | 33 | 1 | 97.06 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 34 | 0 | 100.00 |
| 2008 | 31 | 3 | 91.18 |
| 2012 | 34 | 0 | 100.00 |
| 2011 | 31 | 3 | 91.18 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 32 | 1 | 96.97 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 227 | 270 | 45.67 |