| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 24 | 12 | 66.67 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 28 | 6 | 82.35 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 28 | 5 | 84.85 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 13 | 21 | 38.24 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 26 | 7 | 78.79 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 5 | 40 | 11.11 |
| Totals | 158 | 441 | 26.38 |