| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 7 | 29 | 19.44 |
| 2004 | 1 | 43 | 2.27 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 1 | 33 | 2.94 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 13 | 21 | 38.24 |
| 2012 | 1 | 33 | 2.94 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 8 | 25 | 24.24 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 43 | 2 | 95.56 |
| Totals | 74 | 567 | 11.54 |