| Year | Protected | Not Protected | Protected % |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 13 | 27 | 32.50 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 6 | 35 | 14.63 |
| 2007 | 3 | 28 | 9.68 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 12 | 20 | 37.50 |
| 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 |
| Totals | 34 | 468 | 6.77 |