| Year | Protected | Not Protected | Protected % |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 1 | 30 | 3.23 |
| 2008 | 16 | 15 | 51.61 |
| 2009 | 21 | 11 | 65.63 |
| 2010 | 18 | 14 | 56.25 |
| 2011 | 3 | 29 | 9.38 |
| 2012 | 10 | 23 | 30.30 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| Totals | 69 | 455 | 13.17 |