| Year | Protected | Not Protected | Protected % |
| 2008 | 22 | 9 | 70.97 |
| 2009 | 23 | 9 | 71.88 |
| 2010 | 11 | 21 | 34.38 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 30 | 3 | 90.91 |
| 2014 | 28 | 6 | 82.35 |
| 2015 | 17 | 17 | 50.00 |
| 2016 | 5 | 30 | 14.29 |
| 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 |
| 2023 | 0 | 42 | 0.00 |
| Totals | 169 | 390 | 30.23 |