| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 32 | 4 | 88.89 |
| 2004 | 41 | 3 | 93.18 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 8 | 26 | 23.53 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 13 | 20 | 39.39 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 30 | 15 | 66.67 |
| Totals | 271 | 299 | 47.54 |