| Year | Protected | Not Protected | Protected % |
| 2015 | 31 | 3 | 91.18 |
| 2014 | 21 | 13 | 61.76 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2013 | 6 | 28 | 17.65 |
| 2019 | 0 | 34 | 0.00 |
| 2012 | 34 | 0 | 100.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 34 | 0 | 100.00 |
| 2016 | 32 | 2 | 94.12 |
| 2010 | 29 | 4 | 87.88 |
| 2017 | 10 | 24 | 29.41 |
| Totals | 197 | 210 | 48.40 |