| Year | Protected | Not Protected | Protected % |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 28 | 13 | 68.29 |
| 2006 | 36 | 5 | 87.80 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 25 | 6 | 80.65 |
| 2009 | 30 | 2 | 93.75 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 13 | 19 | 40.63 |
| 2012 | 1 | 32 | 3.03 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| Totals | 196 | 292 | 40.16 |