| Year | Protected | Not Protected | Protected % |
| 2015 | 29 | 5 | 85.29 |
| 2014 | 23 | 11 | 67.65 |
| 2020 | 3 | 31 | 8.82 |
| 2013 | 2 | 32 | 5.88 |
| 2019 | 1 | 33 | 2.94 |
| 2024 | 0 | 34 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 23 | 11 | 67.65 |
| 2021 | 0 | 34 | 0.00 |
| 2022 | 1 | 33 | 2.94 |
| 2016 | 1 | 33 | 2.94 |
| 2017 | 0 | 34 | 0.00 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 83 | 359 | 18.78 |