| Year | Protected | Not Protected | Protected % |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 17 | 24 | 41.46 |
| 2007 | 25 | 6 | 80.65 |
| 2008 | 30 | 1 | 96.77 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 29 | 3 | 90.63 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 9 | 24 | 27.27 |
| 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 | 207 | 354 | 36.90 |