| Year | Protected | Not Protected | Protected % |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 29 | 2 | 93.55 |
| 2008 | 30 | 1 | 96.77 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 12 | 21 | 36.36 |
| 2014 | 31 | 3 | 91.18 |
| 2015 | 13 | 21 | 38.24 |
| 2016 | 29 | 6 | 82.86 |
| 2017 | 1 | 35 | 2.78 |
| 2018 | 1 | 36 | 2.70 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| Totals | 275 | 355 | 43.65 |