| Year | Protected | Not Protected | Protected % |
| 2015 | 33 | 1 | 97.06 |
| 2006 | 27 | 9 | 75.00 |
| 2014 | 32 | 2 | 94.12 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 34 | 0 | 100.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 32 | 2 | 94.12 |
| 2018 | 2 | 32 | 5.88 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 34 | 0 | 100.00 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 25 | 9 | 73.53 |
| 2010 | 33 | 0 | 100.00 |
| 2017 | 27 | 7 | 79.41 |
| 2005 | 0 | 45 | 0.00 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 380 | 277 | 57.84 |