| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 4 | 30 | 11.76 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 32 | 1 | 96.97 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 24 | 18 | 57.14 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 33 | 5 | 86.84 |
| 2000 | 28 | 0 | 100.00 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 158 | 619 | 20.33 |