Year US Dollars adjusted for inflation) 1960 526000000 1961 321000000 1962 122000000 1963 162000000 1964 1300000000 1965 378000000 1966 106000000 1967 98000000 1968 123000000 1969 64000000 1970 44000000 1971 57000000 1972 33000000 1973 51000000 1974 46000000 1975 45000000 1976 196000000 1977 204000000 1978 241000000 1979 107000000 1980 70000000 1981 106000000 1982 142000000 1983 108000000 1984 73000000 1985 20000000 1986 100000000 1987 84000000 1988 133000000 1989 107000000 1990 65000000 1991 948000000 1992 424000000 1993 96000000 1994 80000000 1995 97000000 1996 64000000 1997 223000000 1998 171000000 1999 105000000 2000 98000000 2001 61000000 2002 38000000 2003 55000000 2004 93000000 2005 2000000 2006 68000000 2007 75000000 2008 4000000 2009 74000000 2010 106000000 2011 43000000 2012 87000000 2013 107000000 2014 17000000 2015 44000000 2016 47000000 2017 85000000 2018 193000000 2019 94000000 2020 215000000 2021 41000000 2022 22000000