| Year | Protected | Not Protected | Protected % |
| 2006 | 14 | 22 | 38.89 |
| 2004 | 8 | 36 | 18.18 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 5 | 29 | 14.71 |
| 2007 | 11 | 22 | 33.33 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 7 | 27 | 20.59 |
| 1998 | 0 | 15 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 1 | 33 | 2.94 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 2 | 31 | 6.06 |
| 2002 | 12 | 26 | 31.58 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 22 | 23 | 48.89 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 82 | 491 | 14.31 |