| Year | Protected | Not Protected | Protected % |
| 2015 | 20 | 14 | 58.82 |
| 2014 | 29 | 5 | 85.29 |
| 2009 | 3 | 31 | 8.82 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 20 | 14 | 58.82 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 9 | 25 | 26.47 |
| 2012 | 4 | 30 | 11.76 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 22 | 12 | 64.71 |
| 2016 | 14 | 20 | 41.18 |
| 2010 | 23 | 10 | 69.70 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 144 | 330 | 30.38 |