| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 2 | 42 | 4.55 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 19 | 23 | 45.24 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 17 | 21 | 44.74 |
| 2005 | 1 | 44 | 2.22 |
| Totals | 39 | 503 | 7.20 |