| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 2 | 19 | 9.52 |
| 2001 | 24 | 4 | 85.71 |
| 2002 | 31 | 3 | 91.18 |
| 2003 | 8 | 31 | 20.51 |
| 2004 | 10 | 30 | 25.00 |
| 2005 | 7 | 34 | 17.07 |
| 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 |
| 2012 | 0 | 33 | 0.00 |
| Totals | 82 | 380 | 17.75 |