| Year | Protected | Not Protected | Protected % |
| 2015 | 13 | 21 | 38.24 |
| 2014 | 8 | 26 | 23.53 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 1 | 33 | 2.94 |
| 2013 | 9 | 25 | 26.47 |
| 2019 | 10 | 24 | 29.41 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 5 | 29 | 14.71 |
| 2018 | 30 | 4 | 88.24 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 4 | 30 | 11.76 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 6 | 28 | 17.65 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 86 | 457 | 15.84 |