| Year | Protected | Not Protected | Protected % |
| 2015 | 14 | 20 | 41.18 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 19 | 15 | 55.88 |
| 2009 | 13 | 21 | 38.24 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 1 | 32 | 3.03 |
| 2013 | 1 | 33 | 2.94 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 5 | 29 | 14.71 |
| 2012 | 6 | 28 | 17.65 |
| 2018 | 7 | 27 | 20.59 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 13 | 21 | 38.24 |
| 2010 | 5 | 28 | 15.15 |
| 2017 | 0 | 34 | 0.00 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 84 | 528 | 13.73 |