| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 32 | 4 | 88.89 |
| 2004 | 44 | 0 | 100.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 27 | 7 | 79.41 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 31 | 3 | 91.18 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 4 | 30 | 11.76 |
| 2016 | 0 | 34 | 0.00 |
| 2010 | 5 | 28 | 15.15 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 42 | 3 | 93.33 |
| Totals | 252 | 347 | 42.07 |