| Year | Protected | Not Protected | Protected % |
| 2015 | 32 | 2 | 94.12 |
| 2006 | 27 | 9 | 75.00 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 28 | 6 | 82.35 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 1 | 33 | 2.94 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 16 | 18 | 47.06 |
| 2019 | 22 | 12 | 64.71 |
| 2024 | 0 | 34 | 0.00 |
| 2008 | 32 | 2 | 94.12 |
| 2012 | 34 | 0 | 100.00 |
| 2018 | 28 | 6 | 82.35 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 34 | 0 | 100.00 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 31 | 3 | 91.18 |
| 2025 | 0 | 35 | 0.00 |
| 2010 | 33 | 0 | 100.00 |
| 2017 | 30 | 4 | 88.24 |
| 2005 | 6 | 39 | 13.33 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 421 | 349 | 54.68 |