| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 24 | 12 | 66.67 |
| 2004 | 9 | 35 | 20.45 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 3 | 31 | 8.82 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 24 | 9 | 72.73 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 4 | 30 | 11.76 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 4 | 38 | 9.52 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 0 | 38 | 0.00 |
| 2005 | 24 | 21 | 53.33 |
| Totals | 92 | 587 | 13.55 |