| Year | Protected | Not Protected | Protected % |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 1 | 38 | 2.56 |
| 2004 | 9 | 31 | 22.50 |
| 2005 | 41 | 0 | 100.00 |
| 2006 | 35 | 6 | 85.37 |
| 2007 | 32 | -1 | 103.23 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 31 | 1 | 96.88 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 10 | 23 | 30.30 |
| 2014 | 3 | 31 | 8.82 |
| 2015 | 32 | 2 | 94.12 |
| 2016 | 0 | 35 | 0.00 |
| 2017 | 1 | 35 | 2.78 |
| 2018 | 0 | 37 | 0.00 |
| 2019 | 0 | 38 | 0.00 |
| 2020 | 0 | 39 | 0.00 |
| 2021 | 0 | 30 | 0.00 |
| Totals | 290 | 412 | 41.31 |