| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 15 | 21 | 41.67 |
| 2014 | 2 | 32 | 5.88 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 5 | 28 | 15.15 |
| 2013 | 10 | 24 | 29.41 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 7 | 27 | 20.59 |
| 2012 | 13 | 21 | 38.24 |
| 2018 | 0 | 34 | 0.00 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 7 | 27 | 20.59 |
| 2016 | 1 | 33 | 2.94 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 60 | 529 | 10.19 |