| Year | Protected | Not Protected | Protected % |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 16 | 5 | 76.19 |
| 2001 | 27 | 1 | 96.43 |
| 2002 | 7 | 27 | 20.59 |
| 2003 | 12 | 27 | 30.77 |
| 2004 | 1 | 39 | 2.50 |
| 2005 | 11 | 30 | 26.83 |
| 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 | 76 | 409 | 15.67 |