| Year | Protected | Not Protected | Protected % |
| 2006 | 33 | 3 | 91.67 |
| 2004 | 40 | 4 | 90.91 |
| 2009 | 3 | 31 | 8.82 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 8 | 26 | 23.53 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 21 | 21 | 50.00 |
| 2010 | 6 | 27 | 18.18 |
| 2002 | 0 | 38 | 0.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 39 | 6 | 86.67 |
| Totals | 183 | 319 | 36.45 |