| Year | Protected | Not Protected | Protected % |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 4 | 30 | 11.76 |
| 2003 | 22 | 17 | 56.41 |
| 2004 | 33 | 7 | 82.50 |
| 2005 | 6 | 35 | 14.63 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 3 | 29 | 9.38 |
| 2011 | 3 | 29 | 9.38 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| Totals | 71 | 431 | 14.14 |