Volume is projected to total 15.3 million TEUs for the year, compared with 16.5 million TEUs in 2007.
That would be a decline of 7.1 percent and the lowest total since 2004, when 14 million TEU moved through the ports.
The estimate is down from the 15.43 million projected a month ago, which would have been a 6.5 percent decline from 2007 and the lowest number since 2005's 15.4 million TEUs.