| Year | Protected | Not Protected | Protected % |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 4 | 30 | 11.76 |
| 2003 | 5 | 34 | 12.82 |
| 2004 | 25 | 15 | 62.50 |
| 2005 | 3 | 38 | 7.32 |
| 2006 | 10 | 31 | 24.39 |
| 2007 | 6 | 25 | 19.35 |
| 2008 | 3 | 28 | 9.68 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 56 | 459 | 10.87 |