| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 9 | 35 | 20.45 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 8 | 7 | 53.33 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 6 | 27 | 18.18 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 1 | 41 | 2.38 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 29 | 9 | 76.32 |
| 2000 | 12 | 16 | 42.86 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 18 | 4 | 81.82 |
| Totals | 83 | 422 | 16.44 |