| Year | Protected | Not Protected | Protected % |
| 2006 | 32 | 4 | 88.89 |
| 2004 | 44 | 0 | 100.00 |
| 2009 | 25 | 9 | 73.53 |
| 2007 | 31 | 2 | 93.94 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 33 | 0 | 100.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 42 | 3 | 93.33 |
| Totals | 321 | 147 | 68.59 |