| Year | Protected | Not Protected | Protected % |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 24 | 17 | 58.54 |
| 2006 | 13 | 28 | 31.71 |
| 2007 | 1 | 30 | 3.23 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 31 | 1 | 96.88 |
| 2010 | 26 | 6 | 81.25 |
| 2011 | 26 | 6 | 81.25 |
| 2012 | 29 | 4 | 87.88 |
| 2013 | 32 | 1 | 96.97 |
| 2014 | 1 | 33 | 2.94 |
| 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 | 214 | 346 | 38.21 |