| Year | Protected | Not Protected | Protected % |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 2 | 26 | 7.14 |
| 2002 | 28 | 6 | 82.35 |
| 2003 | 11 | 28 | 28.21 |
| 2004 | 14 | 26 | 35.00 |
| 2005 | 10 | 31 | 24.39 |
| 2006 | 4 | 37 | 9.76 |
| 2007 | 3 | 28 | 9.68 |
| 2008 | 17 | 14 | 54.84 |
| 2009 | 1 | 31 | 3.13 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 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 |
| 2017 | 0 | 36 | 0.00 |
| Totals | 90 | 517 | 14.83 |