Year US Dollars adjusted for inflation) 1960 12000000 1961 107000000 1962 20000000 1963 6000000 1964 40000000 1965 40000000 1966 24000000 1967 1000000 1972 12000000 1973 8000000 1974 19000000 1975 28000000 1976 39000000 1978 18000000 1979 7000000 1980 38000000 1981 48000000 1985 5000000 1987 13000000 1989 2000000 1990 4000000 1991 1000000 1994 11000000 1996 7000000 1997 5000000 1999 7000000 2000 1000000 2001 12000000 2002 1000000 2003 6000000 2004 35000000 2005 0 2006 0 2007 16000000 2009 11000000 2010 2000000 2011 76000000 2012 39000000 2013 50000000 2014 14000000 2015 13000000 2016 22000000 2018 0 2019 2000000 2020 10000000 2022 4000000