| Year | Protected | Not Protected | Protected % |
| 1998 | 5 | 5 | 50.00 |
| 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 | 41 | 0 | 100.00 |
| 2006 | 38 | 3 | 92.68 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 12 | 19 | 38.71 |
| 2009 | 19 | 13 | 59.38 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| Totals | 325 | 137 | 70.35 |