| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 6 | 15 | 28.57 |
| 2001 | 6 | 22 | 21.43 |
| 2002 | 3 | 31 | 8.82 |
| 2003 | 1 | 38 | 2.56 |
| 2004 | 20 | 20 | 50.00 |
| 2005 | 1 | 40 | 2.44 |
| 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 | 37 | 425 | 8.01 |