| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 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 | 1 | 33 | 2.94 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 14 | 20 | 41.18 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 13 | 20 | 39.39 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 28 | 413 | 6.35 |