| Year | Protected | Not Protected | Protected % |
| 2006 | 19 | 17 | 52.78 |
| 2004 | 0 | 44 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 14 | 19 | 42.42 |
| 2008 | 2 | 32 | 5.88 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 19 | 14 | 57.58 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 2 | 40 | 4.76 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 37 | 1 | 97.37 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 1 | 44 | 2.22 |
| 1999 | 21 | 1 | 95.45 |
| Totals | 158 | 347 | 31.29 |