| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 25 | 11 | 69.44 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 9 | 25 | 26.47 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 30 | 3 | 90.91 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 7 | 27 | 20.59 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 4 | 38 | 9.52 |
| 2010 | 1 | 32 | 3.03 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 0 | 38 | 0.00 |
| 2005 | 8 | 37 | 17.78 |
| Totals | 84 | 628 | 11.80 |