Year US Dollars adjusted for inflation) 1960 54000000 1961 65000000 1962 38000000 1963 237000000 1964 77000000 1965 81000000 1966 42000000 1967 76000000 1968 23000000 1969 21000000 1970 15000000 1971 4000000 1972 26000000 1973 13000000 1974 172000000 1975 127000000 1976 90000000 1977 30000000 1978 105000000 1979 47000000 1980 328000000 1981 119000000 1982 132000000 1983 112000000 1984 127000000 1985 206000000 1986 100000000 1987 69000000 1988 144000000 1989 85000000 1990 90000000 1991 64000000 1992 442000000 1993 406000000 1994 252000000 1995 195000000 1996 552000000 1997 397000000 1998 560000000 1999 768000000 2000 472000000 2001 7000000 2002 16000000 2003 242000000 2004 67000000 2005 93000000 2006 132000000 2007 141000000 2008 135000000 2009 42000000 2010 52000000 2011 60000000 2012 79000000 2013 298000000 2014 198000000 2015 293000000 2016 161000000 2017 47000000 2018 87000000 2019 86000000 2020 53000000 2021 53000000 2022 34000000