| Year | Protected | Not Protected | Protected % |
| 2009 | 26 | 6 | 81.25 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 23 | 9 | 71.88 |
| 2012 | 29 | 4 | 87.88 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 20 | 14 | 58.82 |
| 2015 | 20 | 14 | 58.82 |
| 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 |
| 2023 | 0 | 42 | 0.00 |
| Totals | 184 | 344 | 34.85 |