| Year | Protected | Not Protected | Protected % |
| 2006 | 3 | 33 | 8.33 |
| 2004 | 28 | 16 | 63.64 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 1 | 32 | 3.03 |
| 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 | 3 | 39 | 7.14 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 0 | 38 | 0.00 |
| 2000 | 1 | 27 | 3.57 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 36 | 469 | 7.13 |