| Year | Protected | Not Protected | Protected % |
| 2015 | 1 | 33 | 2.94 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 11 | 23 | 32.35 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 10 | 24 | 29.41 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 26 | 8 | 76.47 |
| 2012 | 19 | 15 | 55.88 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 34 | 0 | 100.00 |
| 2016 | 30 | 4 | 88.24 |
| 2010 | 33 | 0 | 100.00 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 231 | 279 | 45.29 |