| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 24 | 10 | 70.59 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 15 | 19 | 44.12 |
| 2012 | 18 | 16 | 52.94 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 27 | 7 | 79.41 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 22 | 11 | 66.67 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 106 | 449 | 19.10 |