| Year | Protected | Not Protected | Protected % |
| 2015 | 15 | 19 | 44.12 |
| 2014 | 2 | 32 | 5.88 |
| 2020 | 0 | 34 | 0.00 |
| 2013 | 13 | 21 | 38.24 |
| 2019 | 0 | 34 | 0.00 |
| 2012 | 3 | 31 | 8.82 |
| 2018 | 0 | 34 | 0.00 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 1 | 33 | 2.94 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 1 | 33 | 2.94 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 35 | 440 | 7.37 |