| Year | Protected | Not Protected | Protected % |
| 2006 | 30 | 6 | 83.33 |
| 2004 | 41 | 3 | 93.18 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 28 | 5 | 84.85 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 36 | 6 | 85.71 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 35 | 3 | 92.11 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 41 | 4 | 91.11 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 276 | 229 | 54.65 |