| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 15 | 2 | 88.24 |
| 2000 | 20 | 1 | 95.24 |
| 2001 | 22 | 6 | 78.57 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 19 | 20 | 48.72 |
| 2004 | 10 | 30 | 25.00 |
| 2005 | 35 | 6 | 85.37 |
| 2006 | 27 | 14 | 65.85 |
| 2007 | 21 | 10 | 67.74 |
| 2008 | 1 | 30 | 3.23 |
| 2009 | 5 | 27 | 15.63 |
| 2010 | 7 | 25 | 21.88 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| Totals | 216 | 313 | 40.83 |