| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 5 | 29 | 14.71 |
| 2009 | 12 | 22 | 35.29 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 12 | 22 | 35.29 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 10 | 24 | 29.41 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 6 | 28 | 17.65 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 3 | 30 | 9.09 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 48 | 462 | 9.41 |