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美国海事局每年公布上一年挂靠美国港口的10000 dwt以上各类船舶的挂靠次数和挂靠船舶的总载重能力资料,根据相关数据分析制成的2002—2007年挂靠美国港口的各类船舶的平均载重能力变化情况如图1所示,结果表明总体上各类挂靠船舶的平均载重能力呈现增长趋势;天然气船平均载重能力前几年增长趋势显著,但是近年呈现缓慢的下降趋
The United States Maritime Bureau publishes information on the number of anchored vessels of over 10,000 dwt and the total load capacity of the ships anchored to U.S. ports in the previous year. According to the relevant data, the average of all types of vessels linked to U.S. ports from 2002 to 2007 The change of load capacity is shown in Fig. 1. The results show that the average load carrying capacity of various types of anchored vessels shows an increasing trend as a whole. The average load carrying capacity of natural gas vessels has shown a significant increase in previous years, but has shown a slow downward trend in recent years