| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 22 | 14 | 61.11 |
| 2004 | 20 | 24 | 45.45 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 10 | 23 | 30.30 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 28 | 6 | 82.35 |
| 2012 | 1 | 33 | 2.94 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 0 | 33 | 0.00 |
| 2005 | 16 | 29 | 35.56 |
| Totals | 97 | 374 | 20.59 |