Year US Dollars adjusted for inflation) 1960 13000000 1962 232000000 1963 518000000 1964 301000000 1965 386000000 1966 510000000 1967 299000000 1968 218000000 1969 211000000 1970 510000000 1971 309000000 1972 291000000 1973 369000000 1974 193000000 1975 226000000 1976 415000000 1977 501000000 1978 383000000 1979 126000000 1980 195000000 1981 119000000 1982 47000000 1983 216000000 1984 125000000 1985 26000000 1986 206000000 1987 19000000 1988 5000000 1989 11000000 1990 11000000 1991 26000000 1992 361000000 1993 244000000 1994 239000000 1995 38000000 1996 38000000 1997 11000000 1999 21000000 2000 6000000 2001 18000000 2005 264000000 2006 741000000 2007 914000000 2008 493000000 2009 134000000 2010 178000000 2011 208000000 2012 127000000 2013 1000000 2014 50000000 2015 2000000 2022 30000000