| Year | Protected | Not Protected | Protected % |
| 1998 | 4 | 6 | 40.00 |
| 1999 | 16 | 1 | 94.12 |
| 2000 | 13 | 8 | 61.90 |
| 2001 | 27 | 1 | 96.43 |
| 2002 | 15 | 19 | 44.12 |
| 2003 | 7 | 32 | 17.95 |
| 2004 | 6 | 34 | 15.00 |
| 2005 | 6 | 35 | 14.63 |
| 2006 | 1 | 40 | 2.44 |
| 2007 | 0 | 31 | 0.00 |
| 2008 | 0 | 31 | 0.00 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| Totals | 95 | 302 | 23.93 |