| Year | Protected | Not Protected | Protected % |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 2 | 19 | 9.52 |
| 2001 | 25 | 3 | 89.29 |
| 2002 | 32 | 2 | 94.12 |
| 2003 | 20 | 19 | 51.28 |
| 2004 | 21 | 19 | 52.50 |
| 2005 | 33 | 8 | 80.49 |
| 2006 | 29 | 12 | 70.73 |
| 2007 | 12 | 19 | 38.71 |
| 2008 | 7 | 24 | 22.58 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 181 | 372 | 32.73 |