| Year | Protected | Not Protected | Protected % |
| 2006 | 29 | 7 | 80.56 |
| 2004 | 39 | 5 | 88.64 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 28 | 5 | 84.85 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 16 | 18 | 47.06 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 17 | 25 | 40.48 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 4 | 34 | 10.53 |
| 2005 | 42 | 3 | 93.33 |
| Totals | 175 | 299 | 36.92 |