| Year | Protected | Not Protected | Protected % |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 3 | 36 | 7.69 |
| 2004 | 2 | 38 | 5.00 |
| 2005 | 1 | 40 | 2.44 |
| 2006 | 6 | 35 | 14.63 |
| 2007 | 24 | 7 | 77.42 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 26 | 6 | 81.25 |
| 2011 | 8 | 24 | 25.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 3 | 32 | 8.57 |
| 2017 | 2 | 34 | 5.56 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| Totals | 138 | 534 | 20.54 |