| Year | Protected | Not Protected | Protected % |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 23 | 9 | 71.88 |
| 2010 | 18 | 14 | 56.25 |
| 2011 | 26 | 6 | 81.25 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 22 | 11 | 66.67 |
| 2014 | 34 | 0 | 100.00 |
| 2015 | 33 | 1 | 97.06 |
| 2016 | 32 | 3 | 91.43 |
| 2017 | 18 | 18 | 50.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| 2023 | 0 | 42 | 0.00 |
| Totals | 270 | 289 | 48.30 |