| Year | Protected | Not Protected | Protected % |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 26 | 14 | 65.00 |
| 2005 | 41 | 0 | 100.00 |
| 2006 | 39 | 2 | 95.12 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 26 | 5 | 83.87 |
| 2009 | 17 | 15 | 53.13 |
| 2010 | 26 | 6 | 81.25 |
| 2011 | 19 | 13 | 59.38 |
| 2012 | 26 | 7 | 78.79 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| Totals | 251 | 320 | 43.96 |