| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 8 | 28 | 22.22 |
| 2004 | 7 | 37 | 15.91 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 11 | 22 | 33.33 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 1 | 33 | 2.94 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 1 | 32 | 3.03 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 16 | 26 | 38.10 |
| 2010 | 3 | 30 | 9.09 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 2 | 36 | 5.26 |
| 2000 | 1 | 27 | 3.57 |
| 2005 | 8 | 37 | 17.78 |
| 1999 | 13 | 9 | 59.09 |
| Totals | 86 | 691 | 11.07 |