| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 3 | 30 | 9.09 |
| 2014 | 28 | 6 | 82.35 |
| 2015 | 24 | 10 | 70.59 |
| 2016 | 34 | 1 | 97.14 |
| 2017 | 35 | 1 | 97.22 |
| 2018 | 13 | 24 | 35.14 |
| 2019 | 30 | 8 | 78.95 |
| 2020 | 38 | 1 | 97.44 |
| 2021 | 1 | 29 | 3.33 |
| 2022 | 40 | 1 | 97.56 |
| 2023 | 36 | 6 | 85.71 |
| 2024 | 0 | 42 | 0.00 |
| Totals | 282 | 391 | 41.90 |