| Year | Protected | Not Protected | Protected % |
| 2015 | 30 | 4 | 88.24 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 34 | 0 | 100.00 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 2 | 31 | 6.06 |
| 2013 | 34 | 0 | 100.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 34 | 0 | 100.00 |
| 2018 | 0 | 34 | 0.00 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 33 | 1 | 97.06 |
| 2016 | 34 | 0 | 100.00 |
| 2010 | 33 | 0 | 100.00 |
| 2017 | 22 | 12 | 64.71 |
| Totals | 324 | 220 | 59.56 |