| Year | Protected | Not Protected | Protected % |
| 1998 | 10 | 0 | 100.00 |
| 1999 | 7 | 10 | 41.18 |
| 2000 | 20 | 1 | 95.24 |
| 2001 | 27 | 1 | 96.43 |
| 2002 | 32 | 2 | 94.12 |
| 2003 | 3 | 36 | 7.69 |
| 2004 | 1 | 39 | 2.50 |
| 2005 | 21 | 20 | 51.22 |
| 2006 | 2 | 39 | 4.88 |
| 2007 | 4 | 27 | 12.90 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| Totals | 127 | 302 | 29.60 |