| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 31 | 5 | 86.11 |
| 2004 | 44 | 0 | 100.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 28 | 6 | 82.35 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 33 | 1 | 97.06 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 26 | 7 | 78.79 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 37 | 5 | 88.10 |
| 2010 | 15 | 18 | 45.45 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 1 | 37 | 2.63 |
| 2000 | 1 | 27 | 3.57 |
| 2005 | 41 | 4 | 91.11 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 290 | 472 | 38.06 |