Port Manatee reported a dynamic increase in trade activity, and said exports are poised to get a further boost when Air Products begins exporting liquefied natural gas heat exchangers from the port next year. Figures recently released by WorldCity Trade Numbers show the value of Port Manatee’s trade with the world totaled $257.57 million through the first four months of 2014 – up 17.15 percent over the comparable period in 2013. Exports increased by 25.68 percent, while imports rose 14.34 percent.