| Year | Protected | Not Protected | Protected % |
| 2006 | 31 | 5 | 86.11 |
| 2004 | 39 | 5 | 88.64 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 20 | 13 | 60.61 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 4 | 11 | 26.67 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 31 | 2 | 93.94 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 34 | 8 | 80.95 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 24 | 14 | 63.16 |
| 2000 | 26 | 2 | 92.86 |
| 2005 | 42 | 3 | 93.33 |
| 1999 | 8 | 14 | 36.36 |
| Totals | 259 | 314 | 45.20 |