| Year | Protected | Not Protected | Protected % |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 5 | 36 | 12.20 |
| 2007 | 10 | 21 | 32.26 |
| 2008 | 2 | 29 | 6.45 |
| 2009 | 5 | 27 | 15.63 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 34 | 0 | 100.00 |
| 2015 | 34 | 0 | 100.00 |
| 2016 | 35 | 0 | 100.00 |
| 2017 | 36 | 0 | 100.00 |
| 2018 | 36 | 1 | 97.30 |
| 2019 | 23 | 15 | 60.53 |
| 2020 | 29 | 10 | 74.36 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| 2023 | 0 | 42 | 0.00 |
| Totals | 282 | 390 | 41.96 |