| Year | Protected | Not Protected | Protected % |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 35 | 6 | 85.37 |
| 2007 | 32 | -1 | 103.23 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 31 | 2 | 93.94 |
| 2013 | 31 | 2 | 93.94 |
| 2014 | 8 | 26 | 23.53 |
| 2015 | 4 | 30 | 11.76 |
| 2016 | 1 | 34 | 2.86 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| Totals | 269 | 291 | 48.04 |