| Year | Protected | Not Protected | Protected % |
| 2001 | 1 | 27 | 3.57 |
| 2002 | 22 | 12 | 64.71 |
| 2003 | 19 | 20 | 48.72 |
| 2004 | 9 | 31 | 22.50 |
| 2005 | 40 | 1 | 97.56 |
| 2006 | 33 | 8 | 80.49 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 26 | 5 | 83.87 |
| 2009 | 3 | 29 | 9.38 |
| 2010 | 6 | 26 | 18.75 |
| 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 | 190 | 325 | 36.89 |