| Year | Protected | Not Protected | Protected % |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 2 | 39 | 4.88 |
| 2006 | 32 | 9 | 78.05 |
| 2007 | 24 | 7 | 77.42 |
| 2008 | 28 | 3 | 90.32 |
| 2009 | 15 | 17 | 46.88 |
| 2010 | 19 | 13 | 59.38 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 25 | 8 | 75.76 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| Totals | 210 | 428 | 32.92 |