| Year | Protected | Not Protected | Protected % |
| 2015 | 12 | 22 | 35.29 |
| 2006 | 32 | 4 | 88.89 |
| 2004 | 44 | 0 | 100.00 |
| 2014 | 9 | 25 | 26.47 |
| 2009 | 34 | 0 | 100.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 17 | 17 | 50.00 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 32 | 2 | 94.12 |
| 2012 | 13 | 21 | 38.24 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 32 | 2 | 94.12 |
| 2016 | 0 | 34 | 0.00 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 32 | 1 | 96.97 |
| 2017 | 0 | 34 | 0.00 |
| 2005 | 39 | 6 | 86.67 |
| Totals | 329 | 278 | 54.20 |