| Year | Protected | Not Protected | Protected % |
| 2015 | 19 | 15 | 55.88 |
| 2014 | 8 | 26 | 23.53 |
| 2009 | 27 | 7 | 79.41 |
| 2020 | 0 | 34 | 0.00 |
| 2013 | 19 | 15 | 55.88 |
| 2019 | 0 | 34 | 0.00 |
| 2024 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 19 | 15 | 55.88 |
| 2018 | 0 | 34 | 0.00 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 30 | 4 | 88.24 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 2 | 32 | 5.88 |
| 2010 | 33 | 0 | 100.00 |
| 2017 | 0 | 34 | 0.00 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 157 | 420 | 27.21 |