| Year | Protected | Not Protected | Protected % |
| 2008 | 11 | 20 | 35.48 |
| 2009 | 22 | 10 | 68.75 |
| 2010 | 29 | 3 | 90.63 |
| 2011 | 19 | 13 | 59.38 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 34 | 0 | 100.00 |
| 2015 | 34 | 0 | 100.00 |
| 2016 | 11 | 24 | 31.43 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| Totals | 226 | 220 | 50.67 |