Year US Dollars 1970 8123000 1971 8629000 1972 9488000 1973 8259000 1974 10153000 1975 14084000 1976 16202000 1977 24592000 1978 34001000 1979 53128000 1980 71943000 1981 84408000 1982 122069000 1983 128674000 1984 138034000 1985 175286000 1986 197620000 1987 258628000 1988 287086000 1989 328145000 1990 395586000 1991 447387000 1992 494404000 1993 542370000 1994 622551000 1995 684359000 1996 701225000 1997 672946000 1998 688209000 1999 687189000 2000 769690000 2001 684410000 2002 712574000 2003 705755000 2004 773436000 2005 666297000 2006 657438000 2007 685486000 2008 696917000 2009 760050000 2010 779040000 2011 802850000 2012 868132000 2013 900775000 2014 894503000 2015 888419000 2016 883326000