Year US Dollars 1970 0 1971 0 1972 0 1973 0 1974 0 1975 0 1976 0 1977 0 1978 0 1979 0 1980 0 1981 1320000 1982 1340000 1983 1360000 1984 1380000 1985 1400000 1986 24348000 1987 28011000 1988 26950000 1989 91460000 1990 102607000 1991 1536011000 1992 1512194000 1993 1495419000 1994 1580938000 1995 1691747000 1996 1754429000 1997 1769230000 1998 1839566000 1999 1905499000 2000 1946022000 2001 2016579000 2002 2229060000 2003 2519451000 2004 2725537000 2005 2768997000 2006 2859744000 2007 2064040000 2008 2466050000 2009 3120649000 2010 3684860000 2011 4227457000 2012 6282779000 2013 7131526000 2014 7930289000 2015 9327818000 2016 10230215000