| Year | Protected | Not Protected | Protected % |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 1 | 40 | 2.44 |
| 2007 | 12 | 19 | 38.71 |
| 2008 | 2 | 29 | 6.45 |
| 2009 | 2 | 30 | 6.25 |
| 2010 | 5 | 27 | 15.63 |
| 2011 | 2 | 30 | 6.25 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 22 | 11 | 66.67 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 7 | 27 | 20.59 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| Totals | 53 | 469 | 10.15 |