| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 5 | 39 | 11.36 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2008 | 2 | 32 | 5.88 |
| 1998 | 0 | 15 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 1 | 32 | 3.03 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 13 | 29 | 30.95 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 3 | 35 | 7.89 |
| 2000 | 11 | 17 | 39.29 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 35 | 470 | 6.93 |