| Year | Protected | Not Protected | Protected % |
| 2008 | 14 | 17 | 45.16 |
| 2009 | 22 | 10 | 68.75 |
| 2010 | 31 | 1 | 96.88 |
| 2011 | 31 | 1 | 96.88 |
| 2012 | 32 | 1 | 96.97 |
| 2013 | 30 | 3 | 90.91 |
| 2014 | 1 | 33 | 2.94 |
| 2015 | 1 | 33 | 2.94 |
| 2016 | 1 | 34 | 2.86 |
| 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 |
| Totals | 163 | 313 | 34.24 |