| Year | Protected | Not Protected | Protected % |
| 2015 | 7 | 27 | 20.59 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 34 | 0 | 100.00 |
| 2009 | 33 | 1 | 97.06 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 32 | 2 | 94.12 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 33 | 1 | 97.06 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 20 | 14 | 58.82 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 28 | 5 | 84.85 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 254 | 256 | 49.80 |