| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 1 | 16 | 5.88 |
| 2000 | 1 | 20 | 4.76 |
| 2001 | 8 | 20 | 28.57 |
| 2002 | 2 | 32 | 5.88 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 3 | 37 | 7.50 |
| 2005 | 37 | 4 | 90.24 |
| 2006 | 2 | 39 | 4.88 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 7 | 25 | 21.88 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 61 | 502 | 10.83 |