| Year | Protected | Not Protected | Protected % |
| 2006 | 33 | 3 | 91.67 |
| 2004 | 44 | 0 | 100.00 |
| 2009 | 34 | 0 | 100.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 1998 | 14 | 1 | 93.33 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 33 | 0 | 100.00 |
| 2011 | 7 | 27 | 20.59 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 25 | 8 | 75.76 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 44 | 1 | 97.78 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 431 | 108 | 79.96 |