Descartes Systems Group noted in its monthly global shipping report that containerized import volume increased 8.2% from the prior year to 2,400,627 20-foot-equivalent units in June. Harrington pointed to the increased enforcement as one of the main reasons for the tightening, as well as increased volume, immigration enforcement and cost increases. The South Carolina Ports Authority reported that container volume decreased 3.5% to 199,694 from 206,907. Port Houston reported that container volume increased 18% to 389,962 from 331,864. Port of Oakland reported that container volume increased 7.7% to 181,356 from 168,460.