| Year | Protected | Not Protected | Protected % |
| 1998 | 10 | 0 | 100.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 20 | 1 | 95.24 |
| 2001 | 23 | 5 | 82.14 |
| 2002 | 31 | 3 | 91.18 |
| 2003 | 15 | 24 | 38.46 |
| 2004 | 18 | 22 | 45.00 |
| 2005 | 29 | 12 | 70.73 |
| 2006 | 13 | 28 | 31.71 |
| 2007 | 1 | 30 | 3.23 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| Totals | 177 | 220 | 44.58 |