| Year | Protected | Not Protected | Protected % |
| 1998 | 10 | 0 | 100.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 18 | 3 | 85.71 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 20 | 19 | 51.28 |
| 2004 | 31 | 9 | 77.50 |
| 2005 | 17 | 24 | 41.46 |
| 2006 | 1 | 40 | 2.44 |
| 2007 | 12 | 19 | 38.71 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| Totals | 188 | 241 | 43.82 |