Year US Dollars 1970 242871000 1971 295917000 1972 354333000 1973 498245000 1974 675465000 1975 871396000 1976 962315000 1977 1355890000 1978 1525327000 1979 1615170000 1980 2273188000 1981 2561917000 1982 3037460000 1983 4202528000 1984 4912584000 1985 5880202000 1986 6895951000 1987 8091575000 1988 8811783000 1989 9875554000 1990 10976875000 1991 11128236000 1992 11407267000 1993 11657297000 1994 12406061000 1995 10591396000 1996 6174326000 1997 6321398000 1998 6379426000 1999 6409337000 2000 6822425000 2001 6386367000 2002 6438633000 2003 6851623000 2004 5089954000 2005 5000022000 2006 4182738000 2007 4106280000 2008 4711433000 2009 5892377000 2010 6999963000 2011 7945763000 2012 5534011000 2013 9712384000 2014 10145469000 2015 10546824000 2016 10990903000