Year US Dollars 1970 197359000 1971 1175689000 1972 1395651000 1973 1743027000 1974 2012128000 1975 2341882000 1976 2702044000 1977 3470568000 1978 4369041000 1979 4204048000 1980 5242014000 1981 5759619000 1982 6133769000 1983 6801892000 1984 7164251000 1985 9095915000 1986 4897648000 1987 5503393000 1988 6008405000 1989 5848907000 1990 6430712000 1991 6556401000 1992 6666322000 1993 6766166000 1994 7225292000 1995 7368197000 1996 7341380000 1997 7103349000 1998 7503609000 1999 7905463000 2000 7186028000 2001 6509288000 2002 7144025000 2003 7306170000 2004 8626963000 2005 8400040000 2006 4096161000 2007 5029477000 2008 6009852000 2009 7685361000 2010 8893151000 2011 10012876000 2012 11588075000 2013 13140981000 2014 14352454000 2015 15504686000 2016 16474516000