| Year | Protected | Not Protected | Protected % |
| 2006 | 5 | 31 | 13.89 |
| 2004 | 35 | 9 | 79.55 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 15 | 0 | 100.00 |
| 2001 | 31 | 2 | 93.94 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 17 | 25 | 40.48 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 37 | 1 | 97.37 |
| 2000 | 26 | 2 | 92.86 |
| 2005 | 42 | 3 | 93.33 |
| 1999 | 21 | 1 | 95.45 |
| Totals | 229 | 242 | 48.62 |