| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 36 | 0 | 100.00 |
| 2004 | 1 | 43 | 2.27 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 14 | 20 | 41.18 |
| 2007 | 30 | 3 | 90.91 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 31 | 3 | 91.18 |
| 2012 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 10 | 23 | 30.30 |
| 2002 | 0 | 38 | 0.00 |
| 2005 | 2 | 43 | 4.44 |
| Totals | 124 | 419 | 22.84 |