Year US Dollars 1970 151676000 1971 172356000 1972 177713000 1973 175532000 1974 202067000 1975 209213000 1976 243894000 1977 300753000 1978 426835000 1979 588278000 1980 690505000 1981 707179000 1982 874406000 1983 1009043000 1984 1074246000 1985 1238563000 1986 1422908000 1987 1935602000 1988 1940761000 1989 2196167000 1990 2605824000 1991 2803290000 1992 2951348000 1993 3052839000 1994 3397570000 1995 3608771000 1996 3710233000 1997 3907825000 1998 3941897000 1999 3537936000 2000 3535146000 2001 3768225000 2002 4019809000 2003 4578283000 2004 4790127000 2005 4461213000 2006 1300725000 2007 1653064000 2008 2292857000 2009 2763177000 2010 2974599000 2011 3262582000 2012 3779371000 2013 8739157000 2014 8952316000 2015 9925262000 2016 9946994000