| Year | Protected | Not Protected | Protected % |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 4 | 35 | 10.26 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 0 | 41 | 0.00 |
| 2006 | 0 | 41 | 0.00 |
| 2007 | 1 | 30 | 3.23 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 30 | 2 | 93.75 |
| 2011 | 31 | 1 | 96.88 |
| 2012 | 31 | 2 | 93.94 |
| 2013 | 29 | 4 | 87.88 |
| 2014 | 32 | 2 | 94.12 |
| 2015 | 2 | 32 | 5.88 |
| 2016 | 1 | 34 | 2.86 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| Totals | 224 | 478 | 31.91 |