| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 28 | 8 | 77.78 |
| 2004 | 44 | 0 | 100.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 26 | 7 | 78.79 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 2 | 32 | 5.88 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 25 | 8 | 75.76 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 33 | 9 | 78.57 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 37 | 1 | 97.37 |
| 2000 | 0 | 28 | 0.00 |
| 2005 | 42 | 3 | 93.33 |
| Totals | 237 | 503 | 32.03 |