Year US Dollars adjusted for inflation) 1960 16000000 1961 27000000 1962 56000000 1963 201000000 1964 73000000 1965 78000000 1966 61000000 1967 47000000 1968 1000000 1969 12000000 1970 99000000 1971 123000000 1972 93000000 1973 22000000 1974 22000000 1975 6000000 1976 12000000 1978 8000000 1979 72000000 1980 195000000 1981 73000000 1982 97000000 1983 145000000 1984 13000000 1985 28000000 1986 19000000 1987 7000000 1988 117000000 1989 84000000 1990 5000000 1991 6000000 1992 5000000 1993 8000000 1994 38000000 1995 22000000 1996 9000000 1997 182000000 1998 228000000 1999 48000000 2000 25000000 2001 15000000 2002 81000000 2003 41000000 2004 56000000 2005 26000000 2006 5000000 2007 269000000 2008 190000000 2009 286000000 2010 7000000 2011 8000000 2012 8000000 2013 6000000 2014 2000000 2015 1000000 2016 13000000 2017 10000000 2018 6000000 2019 17000000 2020 13000000 2021 34000000 2022 4000000