| Year | Protected | Not Protected | Protected % |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 7 | 34 | 17.07 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 28 | 3 | 90.32 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 27 | 5 | 84.38 |
| 2010 | 4 | 28 | 12.50 |
| 2011 | 25 | 7 | 78.13 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 17 | 16 | 51.52 |
| 2014 | 30 | 4 | 88.24 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| Totals | 169 | 353 | 32.38 |