| Year | Protected | Not Protected | Protected % |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 10 | 22 | 31.25 |
| 2012 | 27 | 6 | 81.82 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 32 | 2 | 94.12 |
| 2015 | 8 | 26 | 23.53 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 11 | 26 | 29.73 |
| 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 | 121 | 438 | 21.65 |