| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 10 | 24 | 29.41 |
| 2003 | 32 | 7 | 82.05 |
| 2004 | 15 | 25 | 37.50 |
| 2005 | 7 | 34 | 17.07 |
| 2006 | 4 | 37 | 9.76 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| Totals | 68 | 394 | 14.72 |