| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 29 | 5 | 85.29 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 6 | 28 | 17.65 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 6 | 28 | 17.65 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 1 | 33 | 2.94 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 1 | 32 | 3.03 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 43 | 399 | 9.73 |