| Year | Protected | Not Protected | Protected % |
| 2006 | 6 | 30 | 16.67 |
| 2004 | 44 | 0 | 100.00 |
| 2009 | 17 | 17 | 50.00 |
| 2007 | 17 | 16 | 51.52 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 3 | 31 | 8.82 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 15 | 18 | 45.45 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 21 | 17 | 55.26 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 40 | 5 | 88.89 |
| Totals | 205 | 297 | 40.84 |