Year US Dollars 1970 228889000 1971 288645000 1972 406418000 1973 538468000 1974 675860000 1975 932256000 1976 1345441000 1977 1684308000 1978 2312657000 1979 2604254000 1980 2974727000 1981 3366137000 1982 3923156000 1983 4388876000 1984 4364608000 1985 4758649000 1986 4859019000 1987 5630292000 1988 6066337000 1989 6318049000 1990 6678517000 1991 6840937000 1992 6486042000 1993 6957896000 1994 7128845000 1995 6284258000 1996 6069861000 1997 6023868000 1998 6407341000 1999 6874885000 2000 6608484000 2001 7809027000 2002 7957909000 2003 8286476000 2004 8431382000 2005 8693827000 2006 9538870000 2007 9424207000 2008 44852408000 2009 45677153000 2010 48951402000 2011 57117276000 2012 61481232000 2013 68391009000 2014 78067279000 2015 88566149000 2016 89492146000