Year US Dollars adjusted for inflation) 1960 405000000 1961 69000000 1962 181000000 1963 197000000 1964 168000000 1965 117000000 1966 855000000 1967 854000000 1968 1299000000 1969 605000000 1970 629000000 1971 1572000000 1972 569000000 1973 640000000 1974 934000000 1975 636000000 1976 503000000 1977 314000000 1978 370000000 1979 239000000 1980 417000000 1981 261000000 1982 547000000 1983 509000000 1984 283000000 1985 1038000000 1986 1097000000 1987 848000000 1988 853000000 1989 595000000 1990 294000000 1991 197000000 1992 137000000 1993 92000000 1994 34000000 1995 139000000 1996 73000000 1997 9000000 1998 9000000 1999 179000000 2000 18000000 2001 28000000 2002 9000000 2003 8000000 2004 8000000 2005 5000000 2006 5000000 2007 5000000 2008 5000000 2009 4000000 2010 1000000