| Year | Protected | Not Protected | Protected % |
| 1998 | 10 | 0 | 100.00 |
| 1999 | 14 | 3 | 82.35 |
| 2000 | 16 | 5 | 76.19 |
| 2001 | 18 | 10 | 64.29 |
| 2002 | 30 | 4 | 88.24 |
| 2003 | 15 | 24 | 38.46 |
| 2004 | 6 | 34 | 15.00 |
| 2005 | 20 | 21 | 48.78 |
| 2006 | 3 | 38 | 7.32 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| Totals | 132 | 233 | 36.16 |