Year US Dollars 1970 16048000 1971 9107000 1972 8930000 1973 8982000 1974 9276000 1975 10527000 1976 10643000 1977 14398000 1978 19120000 1979 22361000 1980 21536000 1981 34019000 1982 45420000 1983 58503000 1984 55599000 1985 59763000 1986 65314000 1987 80337000 1988 90750000 1989 91652000 1990 112886000 1991 124505000 1992 117301000 1993 149341000 1994 130258000 1995 128150000 1996 140693000 1997 116644000 1998 172157000 1999 137900000 2000 199420000 2001 235654000 2002 372085000 2003 369077000 2004 429595000 2005 408439000 2006 498587000 2007 533683000 2008 584886000 2009 602542000 2010 606245000 2011 578035000 2012 636323000 2013 612518000 2014 663733000 2015 685793000 2016 1296661000