| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 34 | 0 | 100.00 |
| 2007 | 25 | 8 | 75.76 |
| 2013 | 1 | 33 | 2.94 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 34 | 0 | 100.00 |
| 2011 | 34 | 0 | 100.00 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 33 | 0 | 100.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 195 | 268 | 42.12 |