| Year | Protected | Not Protected | Protected % |
| 2015 | 22 | 12 | 64.71 |
| 2006 | 34 | 2 | 94.44 |
| 2004 | 0 | 44 | 0.00 |
| 2014 | 12 | 22 | 35.29 |
| 2009 | 34 | 0 | 100.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 31 | 3 | 91.18 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 33 | 1 | 97.06 |
| 2012 | 33 | 1 | 97.06 |
| 2018 | 9 | 25 | 26.47 |
| 2021 | 0 | 34 | 0.00 |
| 2011 | 33 | 1 | 97.06 |
| 2022 | 0 | 34 | 0.00 |
| 2016 | 31 | 3 | 91.18 |
| 2010 | 32 | 1 | 96.97 |
| 2017 | 20 | 14 | 58.82 |
| 2005 | 38 | 7 | 84.44 |
| 2023 | 0 | 34 | 0.00 |
| Totals | 395 | 306 | 56.35 |