| Year | Protected | Not Protected | Protected % |
| 1998 | 5 | 5 | 50.00 |
| 1999 | 10 | 7 | 58.82 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 26 | 2 | 92.86 |
| 2002 | 21 | 13 | 61.76 |
| 2003 | 14 | 25 | 35.90 |
| 2004 | 14 | 26 | 35.00 |
| 2005 | 5 | 36 | 12.20 |
| 2006 | 12 | 29 | 29.27 |
| 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 |
| Totals | 128 | 367 | 25.86 |