| Year | Protected | Not Protected | Protected % |
| 2008 | 2 | 29 | 6.45 |
| 2009 | 31 | 1 | 96.88 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 18 | 15 | 54.55 |
| 2014 | 26 | 8 | 76.47 |
| 2015 | 33 | 1 | 97.06 |
| 2016 | 32 | 3 | 91.43 |
| 2017 | 36 | 0 | 100.00 |
| 2018 | 17 | 20 | 45.95 |
| 2019 | 16 | 22 | 42.11 |
| 2020 | 1 | 38 | 2.56 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| 2023 | 0 | 42 | 0.00 |
| Totals | 309 | 250 | 55.28 |