| Year | Protected | Not Protected | Protected % |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 6 | 25 | 19.35 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 5 | 27 | 15.63 |
| 2011 | 1 | 31 | 3.13 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 8 | 25 | 24.24 |
| 2014 | 3 | 31 | 8.82 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| Totals | 23 | 572 | 3.87 |