| Year | Protected | Not Protected | Protected % |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 13 | 28 | 31.71 |
| 2007 | 28 | 3 | 90.32 |
| 2008 | 30 | 1 | 96.77 |
| 2009 | 24 | 8 | 75.00 |
| 2010 | 31 | 1 | 96.88 |
| 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 | 36 | 0 | 100.00 |
| 2018 | 36 | 1 | 97.30 |
| 2019 | 33 | 5 | 86.84 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| 2023 | 0 | 42 | 0.00 |
| 2024 | 0 | 42 | 0.00 |
| 2025 | 0 | 42 | 0.00 |
| Totals | 432 | 324 | 57.14 |