| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 24 | 4 | 85.71 |
| 2002 | 29 | 5 | 85.29 |
| 2003 | 5 | 34 | 12.82 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 8 | 33 | 19.51 |
| 2007 | 2 | 29 | 6.45 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 15 | 17 | 46.88 |
| 2010 | 6 | 26 | 18.75 |
| 2011 | 4 | 28 | 12.50 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 1 | 32 | 3.03 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| Totals | 94 | 504 | 15.72 |