| 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 | 5 | 29 | 14.71 |
| 2007 | 3 | 30 | 9.09 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 22 | 12 | 64.71 |
| 2012 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 0 | 33 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 30 | 475 | 5.94 |