NAME：该笔资料的检索代号 (retrieval code of the series)
DESCRIPTION：该笔资料之全名 (full name of the series)
FREQ：该笔资料之频率 (available frequencies of the series)
            (A：年资料，Q：季资料，M：月资料，W：周资料，D：日资料，S：半年资料)
START：该笔资料在资料库之起始期间 (beginning date of the series)

单位：千公吨、百万吨海浬 (1,000 M.T., 1,000,000 Ton-Miles)

　

NAME	DESCRIPTION	FREQ	START
WT@TOTAL	Waterborne Commerce - Cargo Tonnage - Grand Total (1000 metric tons)	A	1956
	国籍船舶货运量 - 货运吨数 (千公吨)	M	78:01
WTM@TOTAL	Waterborne Commerce - Ton-Nautical Mile - Grand Total (million ton-miles)	A	1956
	国籍船舶货运量 - 延吨海浬 (百万吨海浬)	M	78:01