Year current US$ 1973 19999.9995529652 1974 9999.99977648258 1975 9999.99977648258 1976 9999.99977648258 1977 9999.99977648258 1978 29999.999329447703 1979 29999.999329447703 1980 29999.999329447703 1981 9999.99977648258 1982 9999.99977648258 1983 39999.9991059303 1984 29999.999329447703 1985 39999.9991059303 1986 349999.99403953605 1987 59999.9986588955 1988 200000.00298023198 1989 39999.9991059303 1990 180000.00715255702 1991 259999.990463257 1992 479999.989271164 1993 150000.005960464 1994 59999.9986588955 1996 39999.9991059303 1997 19999.9995529652 1999 9999.99977648258 2005 159999.99642372102