| Year | Protected | Not Protected | Protected % |
| 1998 | 6 | 4 | 60.00 |
| 1999 | 8 | 9 | 47.06 |
| 2000 | 5 | 16 | 23.81 |
| 2001 | 27 | 1 | 96.43 |
| 2002 | 10 | 24 | 29.41 |
| 2003 | 1 | 38 | 2.56 |
| 2004 | 18 | 22 | 45.00 |
| 2005 | 27 | 14 | 65.85 |
| 2006 | 30 | 11 | 73.17 |
| 2007 | 1 | 30 | 3.23 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 133 | 430 | 23.62 |