| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 0 | 36 | 0.00 |
| 2004 | 8 | 36 | 18.18 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 1 | 33 | 2.94 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 1 | 33 | 2.94 |
| 2018 | 0 | 34 | 0.00 |
| 2021 | 0 | 34 | 0.00 |
| 2001 | 21 | 12 | 63.64 |
| 2011 | 1 | 33 | 2.94 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 20 | 22 | 47.62 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 17 | 21 | 44.74 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 4 | 41 | 8.89 |
| Totals | 73 | 701 | 9.43 |