| Year | Protected | Not Protected | Protected % |
| 1998 | 7 | 3 | 70.00 |
| 1999 | 6 | 11 | 35.29 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 25 | 3 | 89.29 |
| 2002 | 6 | 28 | 17.65 |
| 2003 | 7 | 32 | 17.95 |
| 2004 | 2 | 38 | 5.00 |
| 2005 | 1 | 40 | 2.44 |
| 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 | 75 | 488 | 13.32 |