| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 1 | 43 | 2.27 |
| 2009 | 1 | 33 | 2.94 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 1 | 14 | 6.67 |
| 2012 | 1 | 33 | 2.94 |
| 2001 | 2 | 31 | 6.06 |
| 2011 | 1 | 33 | 2.94 |
| 2003 | 8 | 34 | 19.05 |
| 2010 | 9 | 24 | 27.27 |
| 2002 | 2 | 36 | 5.26 |
| 2000 | 4 | 24 | 14.29 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 30 | 509 | 5.57 |