| Year | Protected | Not Protected | Protected % |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 5 | 16 | 23.81 |
| 2001 | 13 | 15 | 46.43 |
| 2002 | 26 | 8 | 76.47 |
| 2003 | 13 | 26 | 33.33 |
| 2004 | 5 | 35 | 12.50 |
| 2005 | 8 | 33 | 19.51 |
| 2006 | 2 | 39 | 4.88 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 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 |
| Totals | 72 | 413 | 14.85 |