| Year | Protected | Not Protected | Protected % |
| 2015 | 6 | 28 | 17.65 |
| 2006 | 7 | 29 | 19.44 |
| 2014 | 5 | 29 | 14.71 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 30 | 3 | 90.91 |
| 2013 | 3 | 31 | 8.82 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 14 | 20 | 41.18 |
| 2012 | 3 | 31 | 8.82 |
| 2018 | 7 | 27 | 20.59 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 8 | 26 | 23.53 |
| 2010 | 23 | 10 | 69.70 |
| 2017 | 1 | 33 | 2.94 |
| 2005 | 0 | 45 | 0.00 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 107 | 550 | 16.29 |