Year US Dollars adjusted for inflation) 1960 5000000 1961 2000000 1962 31000000 1963 75000000 1964 97000000 1965 10000000 1966 58000000 1967 128000000 1968 91000000 1969 79000000 1970 25000000 1971 195000000 1972 112000000 1973 229000000 1974 74000000 1975 85000000 1976 394000000 1977 146000000 1978 72000000 1979 310000000 1980 127000000 1981 56000000 1982 25000000 1983 275000000 1984 543000000 1985 405000000 1986 141000000 1987 5000000 1988 14000000 1989 38000000 1991 33000000 1992 13000000 1993 13000000 1994 308000000 1995 843000000 1996 33000000 1997 553000000 1998 39000000 1999 720000000 2000 25000000 2001 26000000 2002 153000000 2003 196000000 2004 73000000 2005 59000000 2006 184000000 2007 502000000 2008 500000000 2009 1291000000 2010 213000000 2011 5000000 2012 17000000 2013 77000000 2014 73000000 2015 118000000 2016 272000000 2017 196000000 2018 93000000 2019 68000000 2020 57000000 2021 133000000 2022 71000000