| Year | Protected | Not Protected | Protected % |
| 2015 | 22 | 12 | 64.71 |
| 2014 | 3 | 31 | 8.82 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 15 | 19 | 44.12 |
| Totals | 40 | 401 | 9.07 |