| Year | Protected | Not Protected | Protected % |
| 2006 | 1 | 35 | 2.78 |
| 2004 | 39 | 5 | 88.64 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 1 | 33 | 2.94 |
| 2007 | 10 | 23 | 30.30 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 9 | 25 | 26.47 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 33 | 0 | 100.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 17 | 11 | 60.71 |
| 2005 | 7 | 38 | 15.56 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 197 | 361 | 35.30 |