| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 33 | 3 | 91.67 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 1 | 33 | 2.94 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 32 | 1 | 96.97 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 12 | 22 | 35.29 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 2 | 32 | 5.88 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 22 | 11 | 66.67 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 1 | 44 | 2.22 |
| Totals | 103 | 452 | 18.56 |