| Year | Protected | Not Protected | Protected % |
| 2015 | 9 | 25 | 26.47 |
| 2006 | 31 | 5 | 86.11 |
| 2004 | 41 | 3 | 93.18 |
| 2014 | 1 | 33 | 2.94 |
| 2009 | 33 | 1 | 97.06 |
| 2020 | 0 | 34 | 0.00 |
| 2007 | 33 | 0 | 100.00 |
| 2013 | 7 | 27 | 20.59 |
| 2019 | 0 | 34 | 0.00 |
| 2008 | 34 | 0 | 100.00 |
| 2012 | 6 | 28 | 17.65 |
| 2018 | 0 | 34 | 0.00 |
| 2011 | 0 | 34 | 0.00 |
| 2016 | 33 | 1 | 97.06 |
| 2010 | 32 | 1 | 96.97 |
| 2017 | 8 | 26 | 23.53 |
| 2005 | 40 | 5 | 88.89 |
| Totals | 308 | 291 | 51.42 |