| Year | Protected | Not Protected | Protected % |
| 1998 | 6 | 4 | 60.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 2 | 19 | 9.52 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 19 | 15 | 55.88 |
| 2003 | 23 | 16 | 58.97 |
| 2004 | 2 | 38 | 5.00 |
| 2005 | 4 | 37 | 9.76 |
| 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 | 56 | 341 | 14.11 |