| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 12 | 22 | 35.29 |
| 2003 | 10 | 29 | 25.64 |
| 2004 | 34 | 6 | 85.00 |
| 2005 | 10 | 31 | 24.39 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 3 | 28 | 9.68 |
| 2008 | 6 | 25 | 19.35 |
| 2009 | 2 | 30 | 6.25 |
| 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 |
| Totals | 77 | 452 | 14.56 |