| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 18 | 3 | 85.71 |
| 2001 | 24 | 4 | 85.71 |
| 2002 | 32 | 2 | 94.12 |
| 2003 | 36 | 3 | 92.31 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 40 | 1 | 97.56 |
| 2006 | 32 | 9 | 78.05 |
| 2007 | 27 | 4 | 87.10 |
| 2008 | 4 | 27 | 12.90 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| Totals | 253 | 176 | 58.97 |