Year US Dollars adjusted for inflation) 1971 6000000 1972 9000000 1973 9000000 1974 1000000 1978 27000000 1979 44000000 1980 48000000 1981 30000000 1982 91000000 1983 101000000 1984 173000000 1985 99000000 1986 28000000 1987 35000000 1988 52000000 1989 25000000 1990 7000000 1991 5000000 1992 14000000 1993 16000000 1994 29000000 1995 9000000 1996 4000000 1997 11000000 1998 2000000 1999 19000000 2000 3000000 2003 24000000 2005 3000000 2006 8000000 2007 32000000 2009 2000000 2010 1000000 2011 0 2013 216000000