| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 30 | 6 | 83.33 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 18 | 16 | 52.94 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 9 | 24 | 27.27 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 5 | 29 | 14.71 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 6 | 28 | 17.65 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 12 | 21 | 36.36 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 34 | 11 | 75.56 |
| Totals | 114 | 485 | 19.03 |