| Year | Protected | Not Protected | Protected % |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 9 | 19 | 32.14 |
| 2002 | 7 | 27 | 20.59 |
| 2003 | 8 | 31 | 20.51 |
| 2004 | 18 | 22 | 45.00 |
| 2005 | 20 | 21 | 48.78 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 2 | 29 | 6.45 |
| 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 | 64 | 438 | 12.75 |