| Year | Protected | Not Protected | Protected % |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 35 | 6 | 85.37 |
| 2007 | 12 | 19 | 38.71 |
| 2008 | 12 | 19 | 38.71 |
| 2009 | 26 | 6 | 81.25 |
| 2010 | 1 | 31 | 3.13 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 6 | 27 | 18.18 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 4 | 30 | 11.76 |
| 2015 | 6 | 28 | 17.65 |
| 2016 | 5 | 30 | 14.29 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| Totals | 107 | 531 | 16.77 |