| Year | Protected | Not Protected | Protected % |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 3 | 38 | 7.32 |
| 2007 | 5 | 26 | 16.13 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 8 | 24 | 25.00 |
| 2010 | 15 | 17 | 46.88 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 31 | 484 | 6.02 |