| Year | Protected | Not Protected | Protected % |
| 2015 | 8 | 26 | 23.53 |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 6 | 28 | 17.65 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 4 | 30 | 11.76 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 12 | 22 | 35.29 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 15 | 18 | 45.45 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 45 | 486 | 8.47 |