| Year | Protected | Not Protected | Protected % |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 13 | 26 | 33.33 |
| 2004 | 12 | 28 | 30.00 |
| 2005 | 1 | 40 | 2.44 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 4 | 27 | 12.90 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 1 | 31 | 3.13 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| Totals | 31 | 404 | 7.13 |