Year-over-year cargo volume at the nation's major retail container ports is expected to fall for the 16th straight month as of November, leaving 2008 on track to be the slowest year since 2004, according to the monthly Port Tracker report released by the National Retail Federation and IHS Global Insight. Volume is projected to total 15.3 million 20-foot-equivalent units (TEU) for the year, compared with 16.5 million TEU in 2007.