Year US Dollars 1970 2337074000 1971 2635938000 1972 2964724000 1973 3326835000 1974 3515016000 1975 3934673000 1976 4123792000 1977 5232471000 1978 5286645000 1979 6056967000 1980 7135606000 1981 8925378000 1982 10519982000 1983 11639495000 1984 12274127000 1985 14474612000 1986 15583215000 1987 17237209000 1988 17214281000 1989 17075302000 1990 17404181000 1991 17371252000 1992 17451116000 1993 19107295000 1994 22097956000 1995 25203862000 1996 29057066000 1997 32139648000 1998 33283764000 1999 34775688000 2000 34272265000 2001 36568828000 2002 33534031000 2003 37273762000 2004 38190545000 2005 37465247000 2006 38310599000 2007 43964490000 2008 46688341000 2009 53330961000 2010 64096821000 2011 73813023000 2012 76781503000 2013 89720423000 2014 101375795000 2015 110875397000 2016 120282048000