Year US Dollars 1970 984933000 1971 1127927000 1972 1186061000 1973 1287838000 1974 1514188000 1975 2659520000 1976 3360847000 1977 5610349000 1978 6923296000 1979 8207899000 1980 9722124000 1981 10579565000 1982 12401137000 1983 13037496000 1984 13908395000 1985 16056154000 1986 17926463000 1987 21029567000 1988 21117135000 1989 22230853000 1990 25026513000 1991 22503088000 1992 22688198000 1993 22114998000 1994 22988002000 1995 23785010000 1996 24233323000 1997 23501648000 1998 23656719000 1999 23059606000 2000 20790302000 2001 18901345000 2002 18103550000 2003 18331891000 2004 17016928000 2005 16253549000 2006 17944740000 2007 20679213000 2008 20956808000 2009 24667544000 2010 27258909000 2011 29923639000 2012 33835732000 2013 39263300000 2014 42809481000 2015 42990393000 2016 46264659000