| Year | Protected | Not Protected | Protected % |
| 2006 | 27 | 9 | 75.00 |
| 2004 | 8 | 36 | 18.18 |
| 2009 | 2 | 32 | 5.88 |
| 2007 | 19 | 14 | 57.58 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 25 | 9 | 73.53 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 30 | 3 | 90.91 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 17 | 25 | 40.48 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 18 | 20 | 47.37 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 2 | 43 | 4.44 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 213 | 326 | 39.52 |