| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 2 | 15 | 11.76 |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 1 | 27 | 3.57 |
| 2002 | 12 | 22 | 35.29 |
| 2003 | 7 | 32 | 17.95 |
| 2004 | 14 | 26 | 35.00 |
| 2005 | 1 | 40 | 2.44 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| Totals | 37 | 360 | 9.32 |