年份 出口总额 进口总额
1950 20.0 21.3
1951 24.2 35.3
1952 27.1 37.5
1953 34.8 46.1
1954 40.0 44.7
1955 48.7 61.1
1956 55.7 53.0
1957 54.5 50.0
1958 67.0 61.7
1959 78.1 71.2
1960 63.3 65.1
1961 47.7 43.0
1962 47.1 33.8
1963 50.0 35.7
1964 55.4 42.1
1965 63.1 55.3
1966 66.0 61.1
1967 58.8 53.4
1968 57.6 50.9
1969 59.8 47.2
1970 56.8 56.1
1971 68.5 52.4
1972 82.9 64.0
1973 116.9 103.6
1974 139.4 152.8
1975 143.0 147.4
1976 134.8 129.3
1977 139.7 132.8
1978 167.6 187.4
1979 211.7 242.9
1980 271.2 298.8
1981 367.6 367.7
1982 413.8 357.5
1983 438.3 421.8
1984 580.5 620.5
1985 808.9 1257.8
1986 1082.1 1498.3
1987 1470.0 1614.2
1988 1766.7 2055.1
1989 1956.0 2199.9
1990 2985.8 2574.3
1991 3827.1 3398.7
1992 4676.3 4443.3
1993 5284.8 5986.2
1994 10421.8 9960.1
1995 12451.8 11048.1
1996 12576.4 11557.4
1997 15160.7 11806.5
1998 15223.6 11626.1
1999 16159.8 13736.5
2000 20634.4 18638.8
2001 22024.4 20159.2
2002 26947.9 24430.3
2003 36287.9 34195.6
2004 49103.3 46435.8
2005 62648.1 54273.7
2006 77594.6 63376.9
2007 93455.6 73284.6
2008 100394.9 79526.5
data.zip （46个子文件） 
exercise 
习题4.6数据.txt 619B 习题2.3数据.txt 394B 习题2.5数据.txt 281B 习题6.2数据.txt 407B 习题4.7数据.txt 441B 习题3.17数据.txt 327B 习题2.6数据.txt 199B 习题3.20数据.txt 443B 习题5.4数据.txt 806B 习题2.2数据.txt 516B 习题4.8数据.txt 1KB 习题5.5数据.txt 366B 习题5.3数据.txt 1015B 习题5.6数据.txt 2KB 习题6.4数据.txt 2KB 习题3.18数据.txt 380B 习题5.1数据.txt 467B 习题6.3数据.txt 1KB 习题3.19数据.txt 1KB 习题4.5数据.txt 401B 习题5.2数据.txt 740B example 
file3.csv 461B file11.csv 283B file14.csv 2KB file23.csv 87KB file22.csv 19KB file8.csv 772B file17.csv 446B file20.csv 5KB file2.csv 3KB file15.csv 627B file24.csv 5KB file25.csv 557B file16.csv 3KB file4.csv 426B file7.csv 540B file9.csv 265B file19.csv 2KB file6.csv 551B file1.csv 2KB file13.csv 403B file18.csv 952B file21.csv 2KB file5.csv 2KB file12.csv 722B file10.csv 1KB资源评论
