| Year | Protected | Not Protected | Protected % |
| 2015 | 30 | 4 | 88.24 |
| 2014 | 20 | 14 | 58.82 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 21 | 13 | 61.76 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 33 | 1 | 97.06 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 12 | 22 | 35.29 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 31 | 3 | 91.18 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 25 | 9 | 73.53 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 172 | 337 | 33.79 |