Year US Dollars 1970 61400000 1971 111055000 1972 119390000 1973 141785000 1974 192928000 1975 204956000 1976 233372000 1977 289672000 1978 346963000 1979 420272000 1980 484855000 1981 603585000 1982 648423000 1983 648738000 1984 620423000 1985 712219000 1986 872668000 1987 1036090000 1988 1036490000 1989 1089993000 1990 1196555000 1991 1271198000 1992 1390146000 1993 1556462000 1994 1557983000 1995 1249602000 1996 1241842000 1997 1200051000 1998 1314137000 1999 1319225000 2000 1248360000 2001 1256747000 2002 1408407000 2003 1575773000 2004 1683351000 2005 1804617000 2006 1528634000 2007 551068000 2008 633809000 2009 856855000 2010 931128000 2011 1050425000 2012 1127198000 2013 1395487000 2014 1237664000 2015 1378425000 2016 1472407000