| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 11 | 33 | 25.00 |
| 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 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 21 | 12 | 63.64 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 6 | 36 | 14.29 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 25 | 13 | 65.79 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 128 | 445 | 22.34 |