Year US Dollars adjusted for inflation) 1960 15000000 1962 16000000 1963 20000000 1967 21000000 1971 5000000 1972 21000000 1973 0 1974 2000000 1975 42000000 1976 19000000 1977 4000000 1978 13000000 1981 15000000 1982 81000000 1983 34000000 1984 26000000 1985 28000000 1986 212000000 1987 29000000 1988 2000000 1990 2000000 1991 42000000 1992 60000000 1993 0 1998 1000000 1999 25000000 2000 3000000 2001 10000000 2003 16000000 2004 14000000 2005 25000000 2006 25000000