| Year | Protected | Not Protected | Protected % |
| 2003 | 4 | 35 | 10.26 |
| 2004 | 38 | 2 | 95.00 |
| 2005 | 41 | 0 | 100.00 |
| 2006 | 38 | 3 | 92.68 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 32 | 0 | 100.00 |
| 2012 | 33 | 0 | 100.00 |
| 2013 | 33 | 0 | 100.00 |
| 2014 | 12 | 22 | 35.29 |
| 2015 | 1 | 33 | 2.94 |
| 2016 | 20 | 15 | 57.14 |
| 2017 | 0 | 36 | 0.00 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| Totals | 378 | 221 | 63.11 |