Year US Dollars 1970 336535000 1971 450889000 1972 525060000 1973 633743000 1974 756099000 1975 786318000 1976 836378000 1977 930313000 1978 1053336000 1979 1171291000 1980 1138757000 1981 1375339000 1982 1369542000 1983 1350734000 1984 1259931000 1985 1468869000 1986 1767437000 1987 2074946000 1988 2267578000 1989 2178936000 1990 2489726000 1991 2626663000 1992 2654764000 1993 2848581000 1994 3115204000 1995 3255474000 1996 3250552000 1997 3522157000 1998 3555861000 1999 3209826000 2000 3091800000 2001 2924009000 2002 3168691000 2003 3177907000 2004 3402605000 2005 3362510000 2006 3437989000 2007 3574536000 2008 3411875000 2009 3414558000 2010 3381294000 2011 3329478000 2012 1380755000 2013 1404458000 2014 1419798000 2015 1389403000 2016 1378171000