Year current US$ 1961 1000000 1962 2000000 1963 3000000 1964 4000000 1965 12979999.5422363 1966 4840000.15258789 1967 4340000.15258789 1968 4460000.03814697 1969 4000000 1970 3000000 1971 4000000 1972 3000000 1973 2000000 1974 3000000 1975 4000000 1976 3000000 1977 4000000 1978 4000000 1979 6000000 1980 8000000 1981 8000000 1982 8000000 1983 10000000 1984 9000000 1985 10000000 1986 12000000 1987 12000000 1988 9000000 1989 11000000 1990 3000000 1991 8000000 1992 13000000 1993 8000000 1994 10000000 1995 8000000 1996 11000000 1997 13000000 1998 13189999.5803833 1999 17389999.3896484 2000 7969999.79019165 2001 26360000.6103516 2002 70120002.746582 2003 58790000.9155273 2004 30059999.4659424 2005 21850000.3814697 2006 21030000.6866455 2007 20909999.8474121 2008 15789999.961853001 2009 17000000 2010 21090000.1525879 2011 19870000.8392334 2012 19719999.3133545 2013 15449999.8092651 2014 14970000.2670288 2015 112769996.64306599 2016 127959999.084473 2017 74519996.6430664 2018 57990001.6784668 2019 57909999.8474121 2020 53279998.779296905 2021 52180000.3051758 2022 41909999.8474121