Year US Dollars 1970 24141000 1971 28420000 1972 36812000 1973 56155000 1974 68571000 1975 79157000 1976 94577000 1977 131961000 1978 142361000 1979 157822000 1980 194662000 1981 233381000 1982 253473000 1983 257905000 1984 263621000 1985 343526000 1986 461863000 1987 617836000 1988 668831000 1989 693534000 1990 698507000 1991 794177000 1992 813886000 1993 875128000 1994 888056000 1995 945981000 1996 932750000 1997 882963000 1998 918822000 1999 924196000 2000 869008000 2001 834817000 2002 1084773000 2003 1063244000 2004 1094313000 2005 1025954000 2006 1027582000 2007 1008445000 2008 989007000 2009 536612000 2010 615160000 2011 549297000 2012 537098000 2013 556292000 2014 641780000 2015 661851000 2016 682203000