| Year | Protected | Not Protected | Protected % |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 4 | 30 | 11.76 |
| 2003 | 1 | 38 | 2.56 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 5 | 36 | 12.20 |
| 2006 | 3 | 38 | 7.32 |
| 2007 | 4 | 27 | 12.90 |
| 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 |
| Totals | 17 | 485 | 3.39 |