| Year | Protected | Not Protected | Protected % |
| 1998 | 10 | 0 | 100.00 |
| 1999 | 16 | 1 | 94.12 |
| 2000 | 20 | 1 | 95.24 |
| 2001 | 21 | 7 | 75.00 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 36 | 3 | 92.31 |
| 2004 | 34 | 6 | 85.00 |
| 2005 | 16 | 25 | 39.02 |
| 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 |
| Totals | 187 | 275 | 40.48 |