| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 15 | 21 | 41.67 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 4 | 30 | 11.76 |
| 2009 | 18 | 16 | 52.94 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 24 | 9 | 72.73 |
| 2013 | 2 | 32 | 5.88 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 11 | 23 | 32.35 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 12 | 21 | 36.36 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 3 | 42 | 6.67 |
| Totals | 89 | 552 | 13.88 |