| Year | Protected | Not Protected | Protected % |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 29 | 11 | 72.50 |
| 2005 | 38 | 3 | 92.68 |
| 2006 | 34 | 7 | 82.93 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 26 | 5 | 83.87 |
| 2009 | 25 | 7 | 78.13 |
| 2010 | 19 | 13 | 59.38 |
| 2011 | 3 | 29 | 9.38 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 205 | 310 | 39.81 |