| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2014 | 1 | 33 | 2.94 |
| 2009 | 2 | 32 | 5.88 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 7 | 27 | 20.59 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 2 | 32 | 5.88 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 25 | 9 | 73.53 |
| 2016 | 1 | 33 | 2.94 |
| 2010 | 2 | 31 | 6.06 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 40 | 434 | 8.44 |