| 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 | 17 | 14 | 54.84 |
| 2008 | 26 | 5 | 83.87 |
| 2009 | 4 | 28 | 12.50 |
| 2010 | 1 | 31 | 3.13 |
| 2011 | 0 | 32 | 0.00 |
| 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 |
| 2018 | 0 | 37 | 0.00 |
| Totals | 48 | 547 | 8.07 |