| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 32 | 4 | 88.89 |
| 2004 | 44 | 0 | 100.00 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 27 | 7 | 79.41 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 29 | 4 | 87.88 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 19 | 15 | 55.88 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 0 | 33 | 0.00 |
| 2011 | 4 | 30 | 11.76 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 20 | 22 | 47.62 |
| 2010 | 25 | 8 | 75.76 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 17 | 21 | 44.74 |
| 2005 | 28 | 17 | 62.22 |
| Totals | 245 | 467 | 34.41 |