| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 17 | 19 | 47.22 |
| 2004 | 23 | 21 | 52.27 |
| 2014 | 0 | 34 | 0.00 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 0 | 33 | 0.00 |
| 2013 | 0 | 34 | 0.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 14 | 1 | 93.33 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 33 | 0 | 100.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 41 | 1 | 97.62 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 25 | 3 | 89.29 |
| 2005 | 21 | 24 | 46.67 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 234 | 543 | 30.12 |