| Year | Protected | Not Protected | Protected % |
| 2015 | 14 | 20 | 41.18 |
| 2006 | 24 | 12 | 66.67 |
| 2004 | 41 | 3 | 93.18 |
| 2014 | 37 | -3 | 108.82 |
| 2009 | 0 | 34 | 0.00 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 1 | 32 | 3.03 |
| 2013 | 7 | 27 | 20.59 |
| 2019 | 4 | 30 | 11.76 |
| 2008 | 0 | 34 | 0.00 |
| 1998 | 15 | 0 | 100.00 |
| 2012 | 0 | 34 | 0.00 |
| 2018 | 0 | 34 | 0.00 |
| 2001 | 24 | 9 | 72.73 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 36 | 6 | 85.71 |
| 2010 | 0 | 33 | 0.00 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 38 | 0 | 100.00 |
| 2000 | 23 | 5 | 82.14 |
| 2005 | 29 | 16 | 64.44 |
| 1999 | 22 | 0 | 100.00 |
| Totals | 315 | 462 | 40.54 |