| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 1 | 43 | 2.27 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 0 | 15 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2003 | 4 | 38 | 9.52 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 12 | 26 | 31.58 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 17 | 420 | 3.89 |