| Year | Protected | Not Protected | Protected % |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 2 | 29 | 6.45 |
| 2008 | 29 | 2 | 93.55 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 31 | 1 | 96.88 |
| 2011 | 28 | 4 | 87.50 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 32 | 1 | 96.97 |
| 2014 | 23 | 11 | 67.65 |
| 2015 | 1 | 33 | 2.94 |
| 2016 | 12 | 23 | 34.29 |
| 2017 | 2 | 34 | 5.56 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| 2022 | 0 | 41 | 0.00 |
| Totals | 225 | 445 | 33.58 |