| Year | Protected | Not Protected | Protected % |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 34 | 7 | 82.93 |
| 2007 | 29 | 2 | 93.55 |
| 2008 | 14 | 17 | 45.16 |
| 2009 | 2 | 30 | 6.25 |
| 2010 | 11 | 21 | 34.38 |
| 2011 | 2 | 30 | 6.25 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 2 | 31 | 6.06 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 6 | 28 | 17.65 |
| 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 | 102 | 457 | 18.25 |