| Year | Protected | Not Protected | Protected % |
| 2006 | 15 | 21 | 41.67 |
| 2004 | 19 | 25 | 43.18 |
| 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 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 31 | 2 | 93.94 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 15 | 27 | 35.71 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 36 | 2 | 94.74 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 181 | 392 | 31.59 |