| Year | Protected | Not Protected | Protected % |
| 2008 | 4 | 27 | 12.90 |
| 2009 | 24 | 8 | 75.00 |
| 2010 | 32 | 0 | 100.00 |
| 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 | 35 | 0 | 100.00 |
| 2017 | 36 | 0 | 100.00 |
| 2018 | 37 | 0 | 100.00 |
| 2019 | 37 | 1 | 97.37 |
| 2020 | 2 | 37 | 5.13 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 16 | 25 | 39.02 |
| 2023 | 1 | 41 | 2.38 |
| 2024 | 0 | 42 | 0.00 |
| 2025 | 0 | 42 | 0.00 |
| Totals | 389 | 254 | 60.50 |