Year US Dollars 1970 31675000 1971 41577000 1972 54885000 1973 65145000 1974 94018000 1975 114510000 1976 133359000 1977 173255000 1978 609490000 1979 631712000 1980 865705000 1981 1024762000 1982 960420000 1983 972235000 1984 978445000 1985 1223454000 1986 1443385000 1987 1651862000 1988 1700350000 1989 1527923000 1990 1757442000 1991 1526039000 1992 1548655000 1993 1574539000 1994 1542267000 1995 1603275000 1996 1554444000 1997 1588605000 1998 1686516000 1999 1716417000 2000 1720694000 2001 1632891000 2002 1850780000 2003 2152688000 2004 1978802000 2005 1965761000 2006 767008000 2007 1095379000 2008 957951000 2009 1257531000 2010 1549513000 2011 2235729000 2012 2351518000 2013 2660465000 2014 2667939000 2015 2918325000 2016 3233062000