| Year | Protected | Not Protected | Protected % |
| 2015 | 32 | 2 | 94.12 |
| 2014 | 10 | 24 | 29.41 |
| 2009 | 26 | 8 | 76.47 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 10 | 24 | 29.41 |
| 2019 | 3 | 31 | 8.82 |
| 2008 | 13 | 21 | 38.24 |
| 2012 | 1 | 33 | 2.94 |
| 2018 | 31 | 3 | 91.18 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 1 | 33 | 2.94 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 32 | 2 | 94.12 |
| 2010 | 6 | 27 | 18.18 |
| 2017 | 33 | 1 | 97.06 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 198 | 378 | 34.38 |