| Year | Protected | Not Protected | Protected % |
| 2006 | 5 | 31 | 13.89 |
| 2004 | 28 | 16 | 63.64 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 20 | 13 | 60.61 |
| 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 | 10 | 32 | 23.81 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 8 | 30 | 21.05 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 13 | 32 | 28.89 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 84 | 421 | 16.63 |