| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 29 | 7 | 80.56 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 21 | 13 | 61.76 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 9 | 24 | 27.27 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 28 | 6 | 82.35 |
| 2012 | 9 | 25 | 26.47 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 9 | 25 | 26.47 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 3 | 30 | 9.09 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 4 | 41 | 8.89 |
| Totals | 112 | 529 | 17.47 |