| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 1 | 43 | 2.27 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 0 | 15 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 31 | 2 | 93.94 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 1 | 41 | 2.38 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 20 | 18 | 52.63 |
| 2000 | 9 | 19 | 32.14 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 16 | 6 | 72.73 |
| Totals | 78 | 427 | 15.45 |