| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 16 | 18 | 47.06 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2011 | 12 | 22 | 35.29 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 10 | 23 | 30.30 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 38 | 415 | 8.39 |