Data within the Index includes all domestic freight modes and is derived from nearly $21 billion in freight transactions processed by Cass annually on behalf of its client base of hundreds of large shippers. These companies represent a broad sampling of industries including consumer packaged goods, food, automotive, chemical, OEM, retail and heavy equipment. Annual freight volume per organization ranges from $1 million to over $1 billion. The diversity of shippers and aggregate volume provide a statistically valid representation of North American shipping activity.