Year US Dollars 1970 345218000 1971 410052000 1972 676590000 1973 1046503000 1974 1538496000 1975 2038616000 1976 2918442000 1977 3661972000 1978 4491698000 1979 4527131000 1980 4770690000 1981 5090777000 1982 5078793000 1983 5335732000 1984 5289769000 1985 6171264000 1986 7190747000 1987 8757682000 1988 8562157000 1989 9251497000 1990 10258588000 1991 10840413000 1992 11004125000 1993 11273324000 1994 12321601000 1995 13239366000 1996 12830258000 1997 12337528000 1998 13202856000 1999 12166588000 2000 11815383000 2001 11623275000 2002 10062785000 2003 11444750000 2004 11535208000 2005 10694719000 2006 11336903000 2007 12469708000 2008 12306290000 2009 13102291000 2010 6145384000 2011 5507620000 2012 5623972000 2013 6177066000 2014 5522884000 2015 5388168000 2016 5076936000