| Year | Protected | Not Protected | Protected % |
| 1998 | 10 | 0 | 100.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 22 | 6 | 78.57 |
| 2002 | 27 | 7 | 79.41 |
| 2003 | 38 | 1 | 97.44 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 33 | 8 | 80.49 |
| 2006 | 35 | 6 | 85.37 |
| 2007 | 27 | 4 | 87.10 |
| 2008 | 30 | 1 | 96.77 |
| 2009 | 1 | 31 | 3.13 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| Totals | 301 | 161 | 65.15 |