| Year | Protected | Not Protected | Protected % |
| 2006 | 26 | 10 | 72.22 |
| 2004 | 43 | 1 | 97.73 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 25 | 8 | 75.76 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 20 | 14 | 58.82 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 33 | 0 | 100.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 29 | 4 | 87.88 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 40 | 5 | 88.89 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 361 | 178 | 66.98 |