| Year | Protected | Not Protected | Protected % |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 13 | 28 | 31.71 |
| 2007 | 26 | 5 | 83.87 |
| 2008 | 20 | 11 | 64.52 |
| 2009 | 10 | 22 | 31.25 |
| 2010 | 31 | 1 | 96.88 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 33 | 1 | 97.06 |
| 2015 | 1 | 33 | 2.94 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| Totals | 232 | 327 | 41.50 |