| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 1 | 20 | 4.76 |
| 2001 | 10 | 18 | 35.71 |
| 2002 | 21 | 13 | 61.76 |
| 2003 | 32 | 7 | 82.05 |
| 2004 | 39 | 1 | 97.50 |
| 2005 | 39 | 2 | 95.12 |
| 2006 | 8 | 33 | 19.51 |
| 2007 | 4 | 27 | 12.90 |
| 2008 | 16 | 15 | 51.61 |
| 2009 | 8 | 24 | 25.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| Totals | 178 | 317 | 35.96 |