Year US Dollars 1970 162260000 1971 162114000 1972 159382000 1973 159152000 1974 161976000 1975 178683000 1976 208532000 1977 292111000 1978 443070000 1979 596484000 1980 685686000 1981 813445000 1982 902592000 1983 1006558000 1984 1080100000 1985 1250204000 1986 1549809000 1987 1847224000 1988 1817049000 1989 1877358000 1990 2062086000 1991 2187244000 1992 2176738000 1993 2237488000 1994 2367413000 1995 2489150000 1996 2423883000 1997 2406200000 1998 2561188000 1999 2588479000 2000 2836280000 2001 3035973000 2002 3293836000 2003 3632796000 2004 3862480000 2005 3950579000 2006 4191790000 2007 3777966000 2008 3160827000 2009 1850281000 2010 418852000 2011 448441000 2012 487153000 2013 530499000 2014 680542000 2015 836846000 2016 951620000