| Year | Protected | Not Protected | Protected % |
| 1998 | 7 | 3 | 70.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 39 | 0 | 100.00 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 39 | 2 | 95.12 |
| 2006 | 39 | 2 | 95.12 |
| 2007 | 14 | 17 | 45.16 |
| 2008 | 5 | 26 | 16.13 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| Totals | 283 | 146 | 65.97 |