| Year | Protected | Not Protected | Protected % |
| 1998 | 9 | 1 | 90.00 |
| 1999 | 16 | 1 | 94.12 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 27 | 1 | 96.43 |
| 2002 | 30 | 4 | 88.24 |
| 2003 | 35 | 4 | 89.74 |
| 2004 | 20 | 20 | 50.00 |
| 2005 | 23 | 18 | 56.10 |
| 2006 | 1 | 40 | 2.44 |
| 2007 | 6 | 25 | 19.35 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| Totals | 188 | 241 | 43.82 |