| Year | Protected | Not Protected | Protected % |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 1 | 20 | 4.76 |
| 2001 | 17 | 11 | 60.71 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 39 | 0 | 100.00 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 40 | 1 | 97.56 |
| 2006 | 38 | 3 | 92.68 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 30 | 1 | 96.77 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 30 | 2 | 93.75 |
| 2011 | 1 | 31 | 3.13 |
| 2012 | 27 | 6 | 81.82 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| Totals | 360 | 228 | 61.22 |