| Year | Protected | Not Protected | Protected % |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 0 | 34 | 0.00 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 1 | 39 | 2.50 |
| 2005 | 39 | 2 | 95.12 |
| 2006 | 28 | 13 | 68.29 |
| 2007 | 7 | 24 | 22.58 |
| 2008 | 14 | 17 | 45.16 |
| 2009 | 18 | 14 | 56.25 |
| 2010 | 11 | 21 | 34.38 |
| 2011 | 9 | 23 | 28.13 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 127 | 426 | 22.97 |