| Year | Protected | Not Protected | Protected % |
| 2002 | 0 | 34 | 0.00 |
| 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 | 0 | 31 | 0.00 |
| 2009 | 2 | 30 | 6.25 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 31 | 1 | 96.88 |
| 2012 | 8 | 25 | 24.24 |
| 2013 | 2 | 31 | 6.06 |
| 2014 | 25 | 9 | 73.53 |
| 2015 | 9 | 25 | 26.47 |
| 2016 | 2 | 33 | 5.71 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| Totals | 111 | 561 | 16.52 |