| Year | Protected | Not Protected | Protected % |
| 2006 | 15 | 21 | 41.67 |
| 2004 | 26 | 18 | 59.09 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 4 | 29 | 12.12 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 31 | 2 | 93.94 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 40 | 2 | 95.24 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 34 | 4 | 89.47 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 37 | 8 | 82.22 |
| 1999 | 21 | 1 | 95.45 |
| Totals | 251 | 254 | 49.70 |