| Year | Protected | Not Protected | Protected % |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 7 | 27 | 20.59 |
| 2003 | 13 | 26 | 33.33 |
| 2004 | 1 | 39 | 2.50 |
| 2005 | 11 | 30 | 26.83 |
| 2006 | 1 | 40 | 2.44 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 29 | 2 | 93.55 |
| 2009 | 31 | 1 | 96.88 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 18 | 14 | 56.25 |
| 2012 | 4 | 29 | 12.12 |
| 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 | 147 | 439 | 25.09 |