| Year | Protected | Not Protected | Protected % |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 1 | 40 | 2.44 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 9 | 22 | 29.03 |
| 2009 | 8 | 24 | 25.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 24 | 8 | 75.00 |
| 2012 | 2 | 31 | 6.06 |
| 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 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| Totals | 44 | 476 | 8.46 |