| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 10 | 26 | 27.78 |
| 2004 | 10 | 34 | 22.73 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 26 | 7 | 78.79 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 8 | 26 | 23.53 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 20 | 13 | 60.61 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 5 | 37 | 11.90 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 6 | 32 | 15.79 |
| 2000 | 22 | 6 | 78.57 |
| 2005 | 3 | 42 | 6.67 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 110 | 516 | 17.57 |