| Year | Protected | Not Protected | Protected % |
| 2015 | 8 | 26 | 23.53 |
| 2014 | 17 | 17 | 50.00 |
| 2020 | 0 | 34 | 0.00 |
| 2013 | 29 | 5 | 85.29 |
| 2019 | 0 | 34 | 0.00 |
| 2012 | 34 | 0 | 100.00 |
| 2018 | 26 | 8 | 76.47 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 2 | 32 | 5.88 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 29 | 5 | 85.29 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 145 | 330 | 30.53 |