| Year | Protected | Not Protected | Protected % |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 5 | 36 | 12.20 |
| 2007 | 30 | 1 | 96.77 |
| 2008 | 24 | 7 | 77.42 |
| 2009 | 3 | 29 | 9.38 |
| 2010 | 8 | 24 | 25.00 |
| 2011 | 28 | 4 | 87.50 |
| 2012 | 7 | 26 | 21.21 |
| 2013 | 5 | 28 | 15.15 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| Totals | 110 | 412 | 21.07 |