Year US Dollars 1970 8345000 1971 15633000 1972 18802000 1973 32603000 1974 41034000 1975 44232000 1976 108234000 1977 172944000 1978 255343000 1979 310867000 1980 352944000 1981 392653000 1982 431286000 1983 453212000 1984 520892000 1985 621358000 1986 870922000 1987 1163999000 1988 1328066000 1989 1474077000 1990 1768539000 1991 1873131000 1992 1917267000 1993 1986718000 1994 2071422000 1995 2158262000 1996 2258223000 1997 2325961000 1998 2459335000 1999 2559998000 2000 2531033000 2001 2585719000 2002 3168467000 2003 2506301000 2004 2949487000 2005 3278601000 2006 3805627000 2007 4987665000 2008 5653262000 2009 6383405000 2010 6504790000 2011 7521585000 2012 8159215000 2013 9795565000 2014 11400236000 2015 13012454000 2016 14159855000