| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 1 | 20 | 4.76 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 3 | 31 | 8.82 |
| 2003 | 39 | 0 | 100.00 |
| 2004 | 30 | 10 | 75.00 |
| 2005 | 8 | 33 | 19.51 |
| 2006 | 10 | 31 | 24.39 |
| 2007 | 16 | 15 | 51.61 |
| 2008 | 6 | 25 | 19.35 |
| 2009 | 7 | 25 | 21.88 |
| 2010 | 7 | 25 | 21.88 |
| 2011 | 4 | 28 | 12.50 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| Totals | 159 | 439 | 26.59 |