| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 2 | 34 | 5.56 |
| 2004 | 4 | 40 | 9.09 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 29 | 4 | 87.88 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 20 | 14 | 58.82 |
| 1998 | 0 | 15 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 9 | 24 | 27.27 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 8 | 34 | 19.05 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 3 | 35 | 7.89 |
| 2000 | 27 | 1 | 96.43 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 19 | 3 | 86.36 |
| Totals | 121 | 520 | 18.88 |