| Year | Protected | Not Protected | Protected % |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 1 | 31 | 3.13 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 2 | 31 | 6.06 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 4 | 30 | 11.76 |
| 2016 | 12 | 23 | 34.29 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 5 | 32 | 13.51 |
| 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 |
| 2024 | 0 | 42 | 0.00 |
| Totals | 24 | 577 | 3.99 |