| Year | Protected | Not Protected | Protected % |
| 2015 | 9 | 25 | 26.47 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 1 | 33 | 2.94 |
| 2009 | 22 | 12 | 64.71 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 20 | 14 | 58.82 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 33 | 1 | 97.06 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 10 | 24 | 29.41 |
| 2010 | 13 | 20 | 39.39 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 108 | 402 | 21.18 |