| Year | Protected | Not Protected | Protected % |
| 2015 | 23 | 11 | 67.65 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 34 | 0 | 100.00 |
| 2009 | 32 | 2 | 94.12 |
| 2007 | 8 | 25 | 24.24 |
| 2013 | 34 | 0 | 100.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 10 | 24 | 29.41 |
| 2012 | 34 | 0 | 100.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 34 | 0 | 100.00 |
| 2016 | 2 | 32 | 5.88 |
| 2010 | 31 | 2 | 93.94 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 242 | 279 | 46.45 |