Year US Dollars adjusted for inflation) 1960 5000000 1961 5000000 1962 12000000 1963 111000000 1964 237000000 1965 234000000 1966 319000000 1967 309000000 1968 288000000 1969 323000000 1970 268000000 1971 278000000 1972 276000000 1973 158000000 1974 232000000 1975 299000000 1976 408000000 1977 383000000 1978 319000000 1979 230000000 1980 209000000 1981 348000000 1982 213000000 1983 117000000 1984 91000000 1985 131000000 1986 265000000 1987 222000000 1988 232000000 1989 20000000 1990 105000000 1991 55000000 1992 56000000 1994 133000000 1995 179000000 1996 46000000 1997 21000000 1998 1000000 1999 65000000 2000 47000000 2001 81000000 2002 56000000 2003 83000000 2004 47000000 2005 18000000 2006 282000000 2007 163000000 2008 73000000 2009 75000000 2010 28000000 2011 8000000 2012 27000000 2013 142000000 2014 24000000 2015 2000000 2016 5000000 2017 10000000 2018 24000000 2019 10000000 2020 0 2021 3000000 2022 452000000