| Year | Protected | Not Protected | Protected % |
| 2015 | 5 | 29 | 14.71 |
| 2006 | 27 | 9 | 75.00 |
| 2004 | 3 | 41 | 6.82 |
| 2014 | 28 | 6 | 82.35 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 17 | 16 | 51.52 |
| 2013 | 33 | 1 | 97.06 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 33 | 1 | 97.06 |
| 2018 | 0 | 34 | 0.00 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 32 | 2 | 94.12 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 2 | 32 | 5.88 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 29 | 4 | 87.88 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 39 | 6 | 86.67 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 316 | 427 | 42.53 |