| Year | Protected | Not Protected | Protected % |
| 2015 | 4 | 30 | 11.76 |
| 2014 | 6 | 28 | 17.65 |
| 2009 | 11 | 23 | 32.35 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 2 | 32 | 5.88 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 5 | 29 | 14.71 |
| 2018 | 1 | 33 | 2.94 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 1 | 33 | 2.94 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 4 | 29 | 12.12 |
| 2017 | 0 | 34 | 0.00 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 34 | 542 | 5.90 |