| Year | Protected | Not Protected | Protected % |
| 2006 | 9 | 27 | 25.00 |
| 2004 | 44 | 0 | 100.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 5 | 28 | 15.15 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 0 | 15 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 26 | 7 | 78.79 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 9 | 19 | 32.14 |
| 2005 | 42 | 3 | 93.33 |
| 1999 | 21 | 1 | 95.45 |
| Totals | 236 | 337 | 41.19 |