| Year | Protected | Not Protected | Protected % |
| 2006 | 7 | 29 | 19.44 |
| 2004 | 37 | 7 | 84.09 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 1 | 32 | 3.03 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 33 | 0 | 100.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 38 | 4 | 90.48 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 36 | 9 | 80.00 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 255 | 250 | 50.50 |