| Year | Protected | Not Protected | Protected % |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 37 | 4 | 90.24 |
| 2006 | 31 | 10 | 75.61 |
| 2007 | 32 | -1 | 103.23 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 31 | 1 | 96.88 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 13 | 20 | 39.39 |
| 2013 | 15 | 18 | 45.45 |
| 2014 | 5 | 29 | 14.71 |
| 2015 | 5 | 29 | 14.71 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| Totals | 264 | 335 | 44.07 |