| Year | Protected | Not Protected | Protected % |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 3 | 29 | 9.38 |
| 2010 | 27 | 5 | 84.38 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 29 | 4 | 87.88 |
| 2013 | 31 | 2 | 93.94 |
| 2014 | 34 | 0 | 100.00 |
| 2015 | 9 | 25 | 26.47 |
| 2016 | 9 | 26 | 25.71 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 1 | 37 | 2.63 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| 2023 | 0 | 42 | 0.00 |
| Totals | 175 | 497 | 26.04 |