| Year | Protected | Not Protected | Protected % |
| 2006 | 30 | 6 | 83.33 |
| 2004 | 30 | 14 | 68.18 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 17 | 17 | 50.00 |
| 2007 | 21 | 12 | 63.64 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 26 | 8 | 76.47 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 6 | 27 | 18.18 |
| 2002 | 0 | 38 | 0.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 39 | 6 | 86.67 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 169 | 389 | 30.29 |