| Year | Protected | Not Protected | Protected % |
| 2015 | 34 | 0 | 100.00 |
| 2006 | 32 | 4 | 88.89 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 26 | 8 | 76.47 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 10 | 24 | 29.41 |
| 2007 | 30 | 3 | 90.91 |
| 2013 | 25 | 9 | 73.53 |
| 2019 | 22 | 12 | 64.71 |
| 2024 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 31 | 3 | 91.18 |
| 2018 | 31 | 3 | 91.18 |
| 2021 | 4 | 30 | 11.76 |
| 2011 | 32 | 2 | 94.12 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 34 | 0 | 100.00 |
| 2010 | 31 | 2 | 93.94 |
| 2017 | 34 | 0 | 100.00 |
| 2005 | 33 | 12 | 73.33 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 477 | 258 | 64.90 |