| Year | Protected | Not Protected | Protected % |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 20 | 11 | 64.52 |
| 2009 | 12 | 20 | 37.50 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 26 | 6 | 81.25 |
| 2012 | 25 | 8 | 75.76 |
| 2013 | 16 | 17 | 48.48 |
| 2014 | 1 | 33 | 2.94 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| Totals | 100 | 422 | 19.16 |