Year US Dollars adjusted for inflation) 1960 139000000 1961 335000000 1962 58000000 1963 134000000 1964 482000000 1965 449000000 1966 66000000 1967 72000000 1968 71000000 1969 19000000 1970 312000000 1971 362000000 1972 111000000 1974 39000000 1975 149000000 1976 356000000 1977 368000000 1978 362000000 1979 57000000 1980 483000000 1981 479000000 1982 473000000 1983 231000000 1984 72000000 1985 89000000 1986 16000000 1987 99000000 1988 98000000 1989 187000000 1990 128000000 1991 154000000 1992 72000000 1993 51000000 1994 88000000 1995 134000000 1996 75000000 1997 77000000 1998 116000000 1999 70000000 2000 50000000 2001 146000000 2002 40000000 2003 50000000 2004 232000000 2005 116000000 2006 84000000 2007 133000000 2008 93000000 2009 130000000 2010 17000000 2012 101000000 2013 38000000 2014 165000000 2015 42000000 2016 101000000 2017 52000000 2018 49000000 2019 43000000 2020 62000000 2021 303000000 2022 145000000