| Year | Protected | Not Protected | Protected % |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 18 | 21 | 46.15 |
| 2004 | 38 | 2 | 95.00 |
| 2005 | 36 | 5 | 87.80 |
| 2006 | 14 | 27 | 34.15 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 15 | 17 | 46.88 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 16 | 16 | 50.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 137 | 399 | 25.56 |