| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 2 | 15 | 11.76 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 24 | 4 | 85.71 |
| 2002 | 32 | 2 | 94.12 |
| 2003 | 12 | 27 | 30.77 |
| 2004 | 17 | 23 | 42.50 |
| 2005 | 5 | 36 | 12.20 |
| 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 |
| 2011 | 0 | 32 | 0.00 |
| Totals | 113 | 316 | 26.34 |