| Year | Protected | Not Protected | Protected % |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 1 | 31 | 3.13 |
| 2010 | 31 | 1 | 96.88 |
| 2011 | 31 | 1 | 96.88 |
| 2012 | 10 | 23 | 30.30 |
| 2013 | 1 | 32 | 3.03 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 6 | 29 | 17.14 |
| 2017 | 4 | 32 | 11.11 |
| 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 |
| Totals | 84 | 433 | 16.25 |