| Year | Protected | Not Protected | Protected % |
| 2015 | 4 | 30 | 11.76 |
| 2006 | 0 | 36 | 0.00 |
| 2014 | 23 | 11 | 67.65 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 32 | 1 | 96.97 |
| 2013 | 34 | 0 | 100.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 34 | 0 | 100.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 33 | 1 | 97.06 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 33 | 0 | 100.00 |
| 2017 | 0 | 34 | 0.00 |
| Totals | 261 | 249 | 51.18 |