Year US Dollars adjusted for inflation) 1960 304000000 1961 38000000 1962 19000000 1963 127000000 1964 34000000 1965 57000000 1966 74000000 1967 150000000 1968 70000000 1969 21000000 1970 57000000 1971 198000000 1972 51000000 1973 278000000 1974 292000000 1975 184000000 1976 415000000 1977 58000000 1978 157000000 1979 138000000 1980 147000000 1981 148000000 1982 343000000 1983 140000000 1984 448000000 1985 8000000 1986 171000000 1987 154000000 1988 84000000 1989 140000000 1990 135000000 1991 109000000 1992 170000000 1993 85000000 1994 81000000 1995 332000000 1996 164000000 1997 285000000 1998 88000000 1999 207000000 2000 226000000 2001 60000000 2002 74000000 2003 187000000 2004 70000000 2005 446000000 2006 1093000000 2007 655000000 2008 391000000 2009 328000000 2010 473000000 2011 327000000 2012 62000000 2013 55000000 2014 140000000 2015 145000000 2016 40000000 2017 49000000 2018 73000000 2019 33000000 2020 295000000 2021 57000000 2022 212000000