| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 32 | 4 | 88.89 |
| 2004 | 44 | 0 | 100.00 |
| 2014 | 1 | 33 | 2.94 |
| 2009 | 8 | 26 | 23.53 |
| 2007 | 10 | 23 | 30.30 |
| 2013 | 11 | 23 | 32.35 |
| 2008 | 0 | 34 | 0.00 |
| 2012 | 34 | 0 | 100.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 34 | 0 | 100.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 1 | 32 | 3.03 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2005 | 43 | 2 | 95.56 |
| Totals | 298 | 346 | 46.27 |