Year US Dollars 1970 485141000 1971 488440000 1972 510141000 1973 504983000 1974 750848000 1975 791022000 1976 189939000 1977 781573000 1978 355900000 1979 773089000 1980 1248332000 1981 1613363000 1982 1932700000 1983 2040559000 1984 2146914000 1985 2529331000 1986 3007392000 1987 3683577000 1988 3683573000 1989 3431377000 1990 3701116000 1991 3908192000 1992 3911343000 1993 3804740000 1994 4096449000 1995 4322001000 1996 4145789000 1997 4108928000 1998 4393984000 1999 4781747000 2000 4726040000 2001 4184257000 2002 4543889000 2003 4979584000 2004 3824732000 2005 3525440000 2006 1526989000 2007 2289482000 2008 2492842000 2009 2807455000 2010 2718689000 2011 2828965000 2012 2954607000 2013 2891381000 2014 2870936000 2015 2958793000 2016 2934513000