| Year | Protected | Not Protected | Protected % |
| 2015 | 3 | 31 | 8.82 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 18 | 16 | 52.94 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 2 | 31 | 6.06 |
| 2013 | 8 | 26 | 23.53 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 8 | 26 | 23.53 |
| 2012 | 2 | 32 | 5.88 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 9 | 25 | 26.47 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 28 | 5 | 84.85 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 78 | 432 | 15.29 |