| Year | Protected | Not Protected | Protected % |
| 2006 | 27 | 9 | 75.00 |
| 2004 | 29 | 15 | 65.91 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 15 | 0 | 100.00 |
| 2001 | 32 | 1 | 96.97 |
| 2003 | 42 | 0 | 100.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 18 | 27 | 40.00 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 251 | 153 | 62.13 |