| 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 | 9 | 23 | 28.13 |
| 2010 | 30 | 2 | 93.75 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 21 | 12 | 63.64 |
| 2014 | 22 | 12 | 64.71 |
| 2015 | 33 | 1 | 97.06 |
| 2016 | 35 | 0 | 100.00 |
| 2017 | 36 | 0 | 100.00 |
| 2018 | 37 | 0 | 100.00 |
| 2019 | 28 | 10 | 73.68 |
| 2020 | 34 | 5 | 87.18 |
| 2021 | 2 | 28 | 6.67 |
| 2022 | 11 | 30 | 26.83 |
| 2023 | 0 | 42 | 0.00 |
| 2024 | 0 | 42 | 0.00 |
| Totals | 363 | 351 | 50.84 |