| Year | Protected | Not Protected | Protected % |
| 2006 | 33 | 3 | 91.67 |
| 2004 | 43 | 1 | 97.73 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 10 | 5 | 66.67 |
| 2001 | 33 | 0 | 100.00 |
| 2003 | 42 | 0 | 100.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 42 | 3 | 93.33 |
| 1999 | 3 | 19 | 13.64 |
| Totals | 244 | 160 | 60.40 |