Année montants (en millions de USD) 1954 2934.57 388.37 3328.94 1955 642.43 105.36 1956 78.27 1557 608.84 1958 84.68 1959 145.03 202.05 1960 1625.08 1961 1547.74 65.78 1962 1963 1964 1026.43 171.26 246.06 1965 7717.34 1966 75.18 1967 319.82 1968 1969 991.05 1970 1962.51 1971 69.71 1972 539.99 1973 1974 53.31 1975 435.23 1976 63.14 1977 1978 1979 264.89 1480.09 1980 137.15 1981 1982 238.93 1983 1131.2 1984 48.99 1985 48.04 703.51 515.94 56.97 102.82 1986 1987 1988 48 1989 44.94 4410.86 39.52 1990 1991 629.3