| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 2 | 34 | 5.56 |
| 2004 | 2 | 42 | 4.55 |
| 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 | 8 | 7 | 53.33 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 28 | 5 | 84.85 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 5 | 37 | 11.90 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 31 | 7 | 81.58 |
| 2000 | 27 | 1 | 96.43 |
| 2005 | 2 | 43 | 4.44 |
| 1999 | 21 | 1 | 95.45 |
| Totals | 126 | 651 | 16.22 |