| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 3 | 33 | 8.33 |
| 2004 | 22 | 22 | 50.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 2 | 32 | 5.88 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 9 | 24 | 27.27 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 10 | 24 | 29.41 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 3 | 30 | 9.09 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 1 | 41 | 2.38 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 1 | 37 | 2.63 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 12 | 33 | 26.67 |
| Totals | 63 | 677 | 8.51 |