| Year | Protected | Not Protected | Protected % |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 2 | 37 | 5.13 |
| 2004 | 2 | 38 | 5.00 |
| 2005 | 2 | 39 | 4.88 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 1 | 30 | 3.23 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 1 | 31 | 3.13 |
| 2010 | 2 | 30 | 6.25 |
| 2011 | 2 | 30 | 6.25 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 12 | 475 | 2.46 |