| Year | Protected | Not Protected | Protected % |
| 2015 | 12 | 22 | 35.29 |
| 2006 | 31 | 5 | 86.11 |
| 2004 | 4 | 40 | 9.09 |
| 2014 | 4 | 30 | 11.76 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 14 | 20 | 41.18 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 32 | 2 | 94.12 |
| 2018 | 0 | 34 | 0.00 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 34 | 0 | 100.00 |
| 2016 | 11 | 23 | 32.35 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 33 | 0 | 100.00 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 43 | 2 | 95.56 |
| Totals | 319 | 356 | 47.26 |