| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 12 | 9 | 57.14 |
| 2001 | 22 | 6 | 78.57 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 33 | 6 | 84.62 |
| 2004 | 31 | 9 | 77.50 |
| 2005 | 23 | 18 | 56.10 |
| 2006 | 3 | 38 | 7.32 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| Totals | 158 | 271 | 36.83 |