| Year | Protected | Not Protected | Protected % |
| 2015 | 0 | 34 | 0.00 |
| 2006 | 4 | 32 | 11.11 |
| 2004 | 25 | 19 | 56.82 |
| 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 | 0 | 15 | 0.00 |
| 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 | 19 | 23 | 45.24 |
| 2010 | 7 | 26 | 21.21 |
| 2017 | 0 | 34 | 0.00 |
| 2002 | 33 | 5 | 86.84 |
| 2000 | 12 | 16 | 42.86 |
| 2005 | 3 | 42 | 6.67 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 127 | 650 | 16.34 |