| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 1 | 43 | 2.27 |
| 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 |
| 1998 | 3 | 12 | 20.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 5 | 28 | 15.15 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 3 | 35 | 7.89 |
| 2000 | 10 | 18 | 35.71 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 2 | 20 | 9.09 |
| Totals | 24 | 549 | 4.19 |