| Year | Protected | Not Protected | Protected % |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 10 | 29 | 25.64 |
| 2004 | 21 | 19 | 52.50 |
| 2005 | 3 | 38 | 7.32 |
| 2006 | 20 | 21 | 48.78 |
| 2007 | 30 | 1 | 96.77 |
| 2008 | 9 | 22 | 29.03 |
| 2009 | 3 | 29 | 9.38 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 7 | 25 | 21.88 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| Totals | 103 | 419 | 19.73 |