| Year | Protected | Not Protected | Protected % |
| 2006 | 11 | 25 | 30.56 |
| 2004 | 44 | 0 | 100.00 |
| 2009 | 23 | 11 | 67.65 |
| 2007 | 31 | 2 | 93.94 |
| 2008 | 26 | 8 | 76.47 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 1 | 32 | 3.03 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 38 | 4 | 90.48 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 30 | 8 | 78.95 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 35 | 10 | 77.78 |
| Totals | 239 | 229 | 51.07 |