Year US Dollars 1970 39801000 1971 47287000 1972 47050000 1973 69572000 1974 126774000 1975 167828000 1976 242227000 1977 434315000 1978 820145000 1979 1103302000 1980 1122269000 1981 998482000 1982 950896000 1983 916724000 1984 801992000 1985 934741000 1986 1064793000 1987 1234543000 1988 1221896000 1989 1175984000 1990 1280411000 1991 1350917000 1992 1352220000 1993 1292462000 1994 1454414000 1995 1474989000 1996 1487244000 1997 1344667000 1998 1471813000 1999 1538398000 2000 1445953000 2001 1422895000 2002 1601847000 2003 1731924000 2004 1838336000 2005 1686932000 2006 1797042000 2007 1969926000 2008 1641684000 2009 1730090000 2010 1278311000 2011 622146000 2012 746772000 2013 896017000 2014 986284000 2015 1054378000 2016 1176008000