| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 2 | 34 | 5.56 |
| 2004 | 3 | 41 | 6.82 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 1 | 33 | 2.94 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 2 | 31 | 6.06 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 6 | 27 | 18.18 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 23 | 19 | 54.76 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 6 | 32 | 15.79 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 1 | 44 | 2.22 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 44 | 718 | 5.77 |