| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 1 | 16 | 5.88 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 39 | 0 | 100.00 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 35 | 6 | 85.37 |
| 2006 | 13 | 28 | 31.71 |
| 2007 | 15 | 16 | 48.39 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 31 | 1 | 96.88 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 4 | 28 | 12.50 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| Totals | 292 | 237 | 55.20 |