| Year | Protected | Not Protected | Protected % |
| 2008 | 18 | 13 | 58.06 |
| 2009 | 26 | 6 | 81.25 |
| 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 | 35 | -1 | 102.94 |
| 2016 | 35 | 0 | 100.00 |
| 2017 | 33 | 3 | 91.67 |
| 2018 | 37 | 0 | 100.00 |
| 2019 | 36 | 2 | 94.74 |
| 2020 | 7 | 32 | 17.95 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| 2023 | 0 | 42 | 0.00 |
| 2024 | 0 | 42 | 0.00 |
| Totals | 391 | 210 | 65.06 |