| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 4 | 24 | 14.29 |
| 2002 | 22 | 12 | 64.71 |
| 2003 | 5 | 34 | 12.82 |
| 2004 | 19 | 21 | 47.50 |
| 2005 | 5 | 36 | 12.20 |
| 2006 | 1 | 40 | 2.44 |
| 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 |
| Totals | 56 | 373 | 13.05 |