| Year | Protected | Not Protected | Protected % |
| 1998 | 2 | 8 | 20.00 |
| 1999 | 11 | 6 | 64.71 |
| 2000 | 6 | 15 | 28.57 |
| 2001 | 1 | 27 | 3.57 |
| 2002 | 11 | 23 | 32.35 |
| 2003 | 14 | 25 | 35.90 |
| 2004 | 23 | 17 | 57.50 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 68 | 495 | 12.08 |