Year US Dollars 1970 35191000 1971 46990000 1972 36534000 1973 47950000 1974 76030000 1975 143033000 1976 155883000 1977 206654000 1978 280957000 1979 308434000 1980 284236000 1981 259157000 1982 220538000 1983 219449000 1984 193968000 1985 216487000 1986 263175000 1987 347956000 1988 395718000 1989 398672000 1990 514179000 1991 616561000 1992 641680000 1993 692277000 1994 784044000 1995 841874000 1996 946590000 1997 956913000 1998 1029975000 1999 1109216000 2000 1098901000 2001 1095688000 2002 1276028000 2003 1539455000 2004 1652256000 2005 1629648000 2006 1757294000 2007 1848762000 2008 1802461000 2009 1874374000 2010 2157557000 2011 2346186000 2012 2361262000 2013 2924996000 2014 2395640000 2015 1617003000 2016 1654990000