| Year | Protected | Not Protected | Protected % |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 39 | 2 | 95.12 |
| 2006 | 35 | 6 | 85.37 |
| 2007 | 14 | 17 | 45.16 |
| 2008 | 3 | 28 | 9.68 |
| 2009 | 26 | 6 | 81.25 |
| 2010 | 8 | 24 | 25.00 |
| 2011 | 5 | 27 | 15.63 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 130 | 357 | 26.69 |