| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 5 | 39 | 11.36 |
| 2009 | 1 | 33 | 2.94 |
| 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 | 23 | 19 | 54.76 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 0 | 38 | 0.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 3 | 42 | 6.67 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 32 | 492 | 6.11 |