| Year | Protected | Not Protected | Protected % |
| 2008 | 17 | 14 | 54.84 |
| 2009 | 12 | 20 | 37.50 |
| 2010 | 5 | 27 | 15.63 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 17 | 16 | 51.52 |
| 2013 | 2 | 31 | 6.06 |
| 2014 | 3 | 31 | 8.82 |
| 2015 | 4 | 30 | 11.76 |
| 2016 | 2 | 33 | 5.71 |
| 2017 | 0 | 36 | 0.00 |
| 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 | 62 | 497 | 11.09 |