| Year | Protected | Not Protected | Protected % |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 28 | 4 | 87.50 |
| 2011 | 31 | 1 | 96.88 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 28 | 6 | 82.35 |
| 2015 | 34 | 0 | 100.00 |
| 2016 | 34 | 1 | 97.14 |
| 2017 | 28 | 8 | 77.78 |
| 2018 | 6 | 31 | 16.22 |
| 2019 | 5 | 33 | 13.16 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| 2023 | 0 | 42 | 0.00 |
| Totals | 323 | 236 | 57.78 |