| Year | Protected | Not Protected | Protected % |
| 1998 | 3 | 7 | 30.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 4 | 17 | 19.05 |
| 2001 | 2 | 26 | 7.14 |
| 2002 | 25 | 9 | 73.53 |
| 2003 | 14 | 25 | 35.90 |
| 2004 | 3 | 37 | 7.50 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 8 | 33 | 19.51 |
| 2007 | 6 | 25 | 19.35 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 1 | 31 | 3.13 |
| 2010 | 1 | 31 | 3.13 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| Totals | 67 | 462 | 12.67 |