U.S. ports continued to post positive tonnage numbers in November. The Seaway’s 2011 year-to-date total cargo shipments from March 22 to November 30 were 33 million metric tons, up 1.23 percent from the same period last year. “With only one of the big three commodities, coal, bettering last year’s pace by 22,000 metric tons, the year-to-date performance of other bulk commodities like petroleum products (up 80 percent), salt (up 32 percent), scrap metal (up 49 percent), and other general cargo like wind turbine components (up 50 percent)…