| 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 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 4 | 32 | 11.11 |
| 2018 | 13 | 24 | 35.14 |
| 2019 | 8 | 30 | 21.05 |
| 2020 | 3 | 36 | 7.69 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 10 | 31 | 24.39 |
| 2023 | 3 | 39 | 7.14 |
| 2024 | 0 | 42 | 0.00 |
| 2025 | 0 | 42 | 0.00 |
| Totals | 41 | 674 | 5.73 |