| Year | Protected | Not Protected | Protected % |
| 2006 | 4 | 32 | 11.11 |
| 2004 | 0 | 44 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 1 | 32 | 3.03 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 0 | 15 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 0 | 38 | 0.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 9 | 36 | 20.00 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 14 | 491 | 2.77 |