| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 14 | 30 | 31.82 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 5 | 29 | 14.71 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 7 | 8 | 46.67 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 27 | 6 | 81.82 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 34 | 8 | 80.95 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 26 | 12 | 68.42 |
| 2000 | 24 | 4 | 85.71 |
| 2005 | 37 | 8 | 82.22 |
| 1999 | 9 | 13 | 40.91 |
| Totals | 183 | 390 | 31.94 |