| Year | Protected | Not Protected | Protected % |
| 2008 | 15 | 16 | 48.39 |
| 2009 | 31 | 1 | 96.88 |
| 2010 | 27 | 5 | 84.38 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 34 | 0 | 100.00 |
| 2015 | 33 | 1 | 97.06 |
| 2016 | 22 | 13 | 62.86 |
| 2017 | 21 | 15 | 58.33 |
| 2018 | 33 | 4 | 89.19 |
| 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 | 314 | 245 | 56.17 |