| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 6 | 30 | 16.67 |
| 2004 | 4 | 40 | 9.09 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 15 | 19 | 44.12 |
| 2007 | 10 | 23 | 30.30 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 6 | 28 | 17.65 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 4 | 29 | 12.12 |
| 2002 | 0 | 38 | 0.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 10 | 35 | 22.22 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 55 | 571 | 8.79 |