| Year | Protected | Not Protected | Protected % |
| 2015 | 17 | 17 | 50.00 |
| 2014 | 22 | 12 | 64.71 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2013 | 34 | 0 | 100.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 34 | 0 | 100.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 34 | 0 | 100.00 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 25 | 8 | 75.76 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 200 | 241 | 45.35 |