| Year | Protected | Not Protected | Protected % |
| 1998 | 6 | 4 | 60.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 15 | 6 | 71.43 |
| 2001 | 2 | 26 | 7.14 |
| 2002 | 1 | 33 | 2.94 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 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 |
| Totals | 41 | 388 | 9.56 |