| Year | Protected | Not Protected | Protected % |
| 1998 | 8 | 2 | 80.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 32 | 2 | 94.12 |
| 2003 | 22 | 17 | 56.41 |
| 2004 | 27 | 13 | 67.50 |
| 2005 | 24 | 17 | 58.54 |
| 2006 | 3 | 38 | 7.32 |
| 2007 | 1 | 30 | 3.23 |
| 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 | 183 | 312 | 36.97 |