| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 0 | 44 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 2 | 31 | 6.06 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 5 | 10 | 33.33 |
| 2001 | 1 | 32 | 3.03 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 0 | 38 | 0.00 |
| 2000 | 1 | 27 | 3.57 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 6 | 16 | 27.27 |
| Totals | 15 | 456 | 3.18 |