| Year | Protected | Not Protected | Protected % |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 1 | 43 | 2.27 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 14 | 1 | 93.33 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 28 | 5 | 84.85 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 2 | 40 | 4.76 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 3 | 35 | 7.89 |
| 2000 | 24 | 4 | 85.71 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 19 | 3 | 86.36 |
| Totals | 91 | 482 | 15.88 |