杭州交通信息网全氯乙烯的副作用:一道英文的统计题! 急用!谢谢!!
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The Environmental Protection Agency requires industry to report releases of any of a list of toxic chemicals. The total amounts released (in thousands of pounds) were 3,395,867 in 1988, 1,236,554 in 1995 and 1,232,783 in 1997. Give an index number of toxic chemical releases in each of these years, with 1988 as the base period. By what percent did releases increase or decrease between 1988 and 1997?