Year US Dollars adjusted for inflation) 1960 6132000000 1961 6290000000 1962 6130000000 1963 9360000000 1964 12316000000 1965 11301000000 1966 8402000000 1967 7236000000 1968 8405000000 1969 11806000000 1970 8980000000 1971 11742000000 1972 10808000000 1973 12031000000 1974 12904000000 1975 15858000000 1976 15798000000 1977 14510000000 1978 13899000000 1979 9909000000 1980 10738000000 1981 13628000000 1982 13988000000 1983 13950000000 1984 11864000000 1985 10781000000 1986 11604000000 1987 12180000000 1988 11858000000 1989 11314000000 1990 10606000000 1991 12489000000 1992 14090000000 1993 13770000000 1994 11480000000 1995 11182000000 1996 10839000000 1997 14500000000 1998 15708000000 1999 11543000000 2000 7651000000 2001 5592000000 2002 4853000000 2003 5624000000 2004 6834000000 2005 6766000000 2006 7552000000 2007 7972000000 2008 7144000000 2009 7202000000 2010 8336000000 2011 8941000000 2012 8999000000 2013 7607000000 2014 9588000000 2015 9918000000 2016 9769000000 2017 11732000000 2018 9674000000 2019 10888000000 2020 9426000000 2021 10994000000 2022 14515000000