| Year | Protected | Not Protected | Protected % |
| 2006 | 3 | 33 | 8.33 |
| 2004 | 15 | 29 | 34.09 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 7 | 26 | 21.21 |
| 2008 | 1 | 33 | 2.94 |
| 1998 | 0 | 15 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2001 | 15 | 18 | 45.45 |
| 2011 | 0 | 34 | 0.00 |
| 2003 | 2 | 40 | 4.76 |
| 2010 | 0 | 33 | 0.00 |
| 2002 | 22 | 16 | 57.89 |
| 2000 | 6 | 22 | 21.43 |
| 2005 | 2 | 43 | 4.44 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 73 | 432 | 14.46 |