| Year | Protected | Not Protected | Protected % |
| 1998 | 3 | 7 | 30.00 |
| 1999 | 1 | 16 | 5.88 |
| 2000 | 3 | 18 | 14.29 |
| 2001 | 15 | 13 | 53.57 |
| 2002 | 18 | 16 | 52.94 |
| 2003 | 34 | 5 | 87.18 |
| 2004 | 38 | 2 | 95.00 |
| 2005 | 31 | 10 | 75.61 |
| 2006 | 2 | 39 | 4.88 |
| 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 |
| 2013 | 0 | 33 | 0.00 |
| Totals | 145 | 350 | 29.29 |