Year US Dollars 1970 119092000 1971 153349000 1972 180465000 1973 214802000 1974 270699000 1975 342815000 1976 432464000 1977 796334000 1978 1111303000 1979 1417948000 1980 1866842000 1981 2186349000 1982 2648432000 1983 3021357000 1984 3281115000 1985 3943827000 1986 4831644000 1987 6261594000 1988 5918248000 1989 7316082000 1990 8332910000 1991 9700260000 1992 7966938000 1993 7630578000 1994 7552881000 1995 7660562000 1996 7379760000 1997 7313840000 1998 7560998000 1999 8106199000 2000 11062641000 2001 11885713000 2002 13015827000 2003 12650321000 2004 13047244000 2005 12903704000 2006 13981823000 2007 14991125000 2008 13969142000 2009 14427064000 2010 17073490000 2011 17668661000 2012 18484353000 2013 23173392000 2014 24281432000 2015 25719578000 2016 27125916000