| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 6 | 30 | 16.67 |
| 2004 | 11 | 33 | 25.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 33 | 1 | 97.06 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 4 | 29 | 12.12 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 31 | 3 | 91.18 |
| 2012 | 2 | 32 | 5.88 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 34 | 0 | 100.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 33 | 0 | 100.00 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 25 | 20 | 55.56 |
| Totals | 179 | 462 | 27.93 |