| Year | Protected | Not Protected | Protected % |
| 1998 | 9 | 1 | 90.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 30 | 4 | 88.24 |
| 2003 | 32 | 7 | 82.05 |
| 2004 | 9 | 31 | 22.50 |
| 2005 | 11 | 30 | 26.83 |
| 2006 | 1 | 40 | 2.44 |
| 2007 | 1 | 30 | 3.23 |
| 2008 | 1 | 30 | 3.23 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| Totals | 160 | 269 | 37.30 |