Year US Dollars 1970 82702000 1971 156518000 1972 158272000 1973 178347000 1974 220850000 1975 328515000 1976 426535000 1977 526378000 1978 610959000 1979 686675000 1980 842486000 1981 916736000 1982 1006137000 1983 1254032000 1984 1313769000 1985 1526060000 1986 1663707000 1987 1765608000 1988 1893970000 1989 1660091000 1990 1963016000 1991 1977501000 1992 1913418000 1993 1967648000 1994 2051773000 1995 2118365000 1996 1607219000 1997 1590392000 1998 1480769000 1999 1433423000 2000 1374370000 2001 1327497000 2002 1390050000 2003 1454033000 2004 1368287000 2005 1238712000 2006 1163026000 2007 848521000 2008 990392000 2009 1427811000 2010 1408289000 2011 2006563000 2012 1974118000 2013 2301906000 2014 2341843000 2015 1639012000 2016 1638937000