| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2014 | 14 | 20 | 41.18 |
| 2009 | 16 | 18 | 47.06 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 6 | 28 | 17.65 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 2 | 32 | 5.88 |
| 2012 | 34 | 0 | 100.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 27 | 7 | 79.41 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 25 | 8 | 75.76 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 124 | 350 | 26.16 |