| Year | Protected | Not Protected | Protected % |
| 2006 | 6 | 30 | 16.67 |
| 2004 | 4 | 40 | 9.09 |
| 2009 | 2 | 32 | 5.88 |
| 2007 | 0 | 33 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 10 | 5 | 66.67 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 23 | 10 | 69.70 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 12 | 30 | 28.57 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 23 | 15 | 60.53 |
| 2000 | 18 | 10 | 64.29 |
| 2005 | 13 | 32 | 28.89 |
| 1999 | 17 | 5 | 77.27 |
| Totals | 128 | 377 | 25.35 |