| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 17 | 4 | 80.95 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 38 | 1 | 97.44 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 40 | 1 | 97.56 |
| 2006 | 8 | 33 | 19.51 |
| 2007 | 1 | 30 | 3.23 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 9 | 23 | 28.13 |
| 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 | 232 | 331 | 41.21 |