| Year | Protected | Not Protected | Protected % |
| 2006 | 30 | 6 | 83.33 |
| 2004 | 36 | 8 | 81.82 |
| 2009 | 1 | 33 | 2.94 |
| 2007 | 23 | 10 | 69.70 |
| 2008 | 9 | 25 | 26.47 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 33 | 0 | 100.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 39 | 3 | 92.86 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 37 | 1 | 97.37 |
| 2000 | 26 | 2 | 92.86 |
| 2005 | 40 | 5 | 88.89 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 311 | 194 | 61.58 |