| Year | Protected | Not Protected | Protected % |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 36 | 4 | 90.00 |
| 2005 | 41 | 0 | 100.00 |
| 2006 | 33 | 8 | 80.49 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 31 | 1 | 96.88 |
| 2011 | 14 | 18 | 43.75 |
| 2012 | 1 | 32 | 3.03 |
| 2013 | 1 | 32 | 3.03 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 251 | 285 | 46.83 |