| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 29 | 7 | 80.56 |
| 2004 | 9 | 35 | 20.45 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 18 | 16 | 52.94 |
| 2007 | 32 | 1 | 96.97 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 21 | 13 | 61.76 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 41 | 1 | 97.62 |
| 2010 | 25 | 8 | 75.76 |
| 2002 | 0 | 38 | 0.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 34 | 11 | 75.56 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 209 | 383 | 35.30 |