| Year | Protected | Not Protected | Protected % |
| 1998 | 9 | 1 | 90.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 1 | 20 | 4.76 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 12 | 22 | 35.29 |
| 2003 | 12 | 27 | 30.77 |
| 2004 | 23 | 17 | 57.50 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 0 | 41 | 0.00 |
| 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 | 57 | 372 | 13.29 |