2004 6.7

1993 6.7

1998 6.7

2001 6.7

1980 6.8

1999 6.8

2003 6.8

1982 6.8

1989 6.8

2001 6.8

1998 6.8

1987 6.8

1989 6.8

1997 6.8

1980 6.8

1988 6.8

2001 6.8

1997 6.8

2002 6.8

1969 6.8