Year US Dollars adjusted for inflation) 1960 145000000 1961 93000000 1962 60000000 1963 227000000 1964 260000000 1965 368000000 1966 757000000 1967 682000000 1968 289000000 1969 524000000 1970 145000000 1971 86000000 1972 68000000 1973 63000000 1974 55000000 1975 49000000 1976 35000000 1977 27000000 1978 24000000 1979 47000000 1980 254000000 1981 435000000 1982 457000000 1983 441000000 1984 337000000 1985 122000000 1986 141000000 1987 198000000 1988 308000000 1989 667000000 1990 369000000 1991 322000000 1992 253000000 1993 181000000 1994 93000000 1995 78000000 1996 151000000 1997 158000000 1998 152000000 1999 155000000 2000 229000000 2001 99000000 2002 90000000 2003 9000000 2004 6000000 2005 14000000 2006 557000000 2007 596000000 2008 603000000 2009 571000000 2010 150000000 2011 607000000 2012 147000000 2013 51000000 2014 16000000 2015 143000000 2016 142000000 2017 352000000 2018 527000000 2019 401000000 2020 427000000 2021 514000000 2022 848000000