| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 8 | 28 | 22.22 |
| 2014 | 5 | 29 | 14.71 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 29 | 4 | 87.88 |
| 2013 | 18 | 16 | 52.94 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 33 | 1 | 97.06 |
| 2012 | 9 | 25 | 26.47 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 12 | 22 | 35.29 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 10 | 23 | 30.30 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 158 | 397 | 28.47 |