| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 19 | 17 | 52.78 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 23 | 11 | 67.65 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 25 | 8 | 75.76 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 33 | 1 | 97.06 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 8 | 26 | 23.53 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 16 | 17 | 48.48 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 0 | 45 | 0.00 |
| Totals | 124 | 475 | 20.70 |