| Year | Protected | Not Protected | Protected % |
| 2006 | 24 | 12 | 66.67 |
| 2004 | 42 | 2 | 95.45 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 11 | 22 | 33.33 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 0 | 15 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 33 | 0 | 100.00 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 41 | 1 | 97.62 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 8 | 20 | 28.57 |
| 2005 | 41 | 4 | 91.11 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 260 | 245 | 51.49 |