| 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 | 0 | 31 | 0.00 |
| 2008 | 2 | 29 | 6.45 |
| 2009 | 13 | 19 | 40.63 |
| 2010 | 14 | 18 | 43.75 |
| 2011 | 19 | 13 | 59.38 |
| 2012 | 31 | 2 | 93.94 |
| 2013 | 1 | 32 | 3.03 |
| 2014 | 8 | 26 | 23.53 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| Totals | 88 | 473 | 15.69 |