| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 30 | 6 | 83.33 |
| 2004 | 44 | 0 | 100.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 6 | 28 | 17.65 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 32 | 1 | 96.97 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 45 | 0 | 100.00 |
| Totals | 270 | 402 | 40.18 |