| Year | Protected | Not Protected | Protected % |
| 2015 | 24 | 10 | 70.59 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 29 | 5 | 85.29 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 20 | 14 | 58.82 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 27 | 7 | 79.41 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 31 | 3 | 91.18 |
| 2016 | 3 | 31 | 8.82 |
| 2010 | 33 | 0 | 100.00 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 268 | 242 | 52.55 |