| Year | Protected | Not Protected | Protected % |
| 2008 | 26 | 5 | 83.87 |
| 2009 | 30 | 2 | 93.75 |
| 2010 | 5 | 27 | 15.63 |
| 2011 | 30 | 2 | 93.75 |
| 2012 | 2 | 31 | 6.06 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 12 | 22 | 35.29 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 1 | 34 | 2.86 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| Totals | 106 | 411 | 20.50 |