Data are nonexistent.
Individual modes do not sum to total trade figures because not all U.S. modes of transportation are included here. See Appendix B for a list of U.S. modes not specifically identified on this table. Transshipment data cannot be separated from the modal totals for road, rail and pipeline for 1995 and 1996. For an explanation of transshipment data, see Appendix B. Also see Appendix B for information on modal percentage shares, using 1997 data from which transshipment data have been excluded from the land modes. U.S. Census Bureau.