| 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 | 0 | 34 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 25 | 8 | 75.76 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 36 | 6 | 85.71 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 36 | 2 | 94.74 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 6 | 39 | 13.33 |
| Totals | 108 | 360 | 23.08 |