| Year | Protected | Not Protected | Protected % |
| 2015 | 1 | 33 | 2.94 |
| 2006 | 31 | 5 | 86.11 |
| 2004 | 30 | 14 | 68.18 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 26 | 8 | 76.47 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 32 | 1 | 96.97 |
| 2013 | 4 | 30 | 11.76 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 19 | 15 | 55.88 |
| 2012 | 8 | 26 | 23.53 |
| 2018 | 1 | 33 | 2.94 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 18 | 16 | 52.94 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 42 | 0 | 100.00 |
| 2010 | 27 | 6 | 81.82 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 0 | 38 | 0.00 |
| 2005 | 40 | 5 | 88.89 |
| Totals | 279 | 434 | 39.13 |