| Year | Protected | Not Protected | Protected % |
| 1998 | 10 | 0 | 100.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 3 | 36 | 7.69 |
| 2004 | 21 | 19 | 52.50 |
| 2005 | 31 | 10 | 75.61 |
| 2006 | 29 | 12 | 70.73 |
| 2007 | 27 | 4 | 87.10 |
| 2008 | 19 | 12 | 61.29 |
| 2009 | 3 | 29 | 9.38 |
| 2010 | 5 | 27 | 15.63 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| Totals | 248 | 247 | 50.10 |