| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 5 | 26 | 16.13 |
| 2008 | 28 | 3 | 90.32 |
| 2009 | 31 | 1 | 96.88 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 34 | 0 | 100.00 |
| 2015 | 34 | 0 | 100.00 |
| 2016 | 35 | 0 | 100.00 |
| 2017 | 31 | 5 | 86.11 |
| 2018 | 1 | 36 | 2.70 |
| 2019 | 1 | 37 | 2.63 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| Totals | 330 | 259 | 56.03 |