| Year | Protected | Not Protected | Protected % |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 5 | 36 | 12.20 |
| 2006 | 31 | 10 | 75.61 |
| 2007 | 10 | 21 | 32.26 |
| 2008 | 22 | 9 | 70.97 |
| 2009 | 3 | 29 | 9.38 |
| 2010 | 17 | 15 | 53.13 |
| 2011 | 1 | 31 | 3.13 |
| 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 |
| 2017 | 0 | 36 | 0.00 |
| Totals | 89 | 469 | 15.95 |