| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 2 | 42 | 4.55 |
| 2009 | 2 | 32 | 5.88 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 3 | 30 | 9.09 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 0 | 38 | 0.00 |
| 2000 | 11 | 17 | 39.29 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 18 | 506 | 3.44 |