| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 3 | 14 | 17.65 |
| 2000 | 9 | 12 | 42.86 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 10 | 24 | 29.41 |
| 2003 | 21 | 18 | 53.85 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 41 | 0 | 100.00 |
| 2006 | 31 | 10 | 75.61 |
| 2007 | 28 | 3 | 90.32 |
| 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 | 183 | 279 | 39.61 |