Year US Dollars 1970 4085000 1971 4339000 1972 5070000 1973 4826000 1974 5274000 1975 4827000 1976 9166000 1977 20670000 1978 33313000 1979 71829000 1980 63043000 1981 60228000 1982 69804000 1983 100640000 1984 98759000 1985 118126000 1986 121871000 1987 137195000 1988 132277000 1989 137218000 1990 142753000 1991 161782000 1992 180961000 1993 194553000 1994 198666000 1995 255158000 1996 281537000 1997 450096000 1998 333460000 1999 416579000 2000 629902000 2001 721981000 2002 849529000 2003 1061730000 2004 964609000 2005 1021919000 2006 1053036000 2007 1074411000 2008 1274805000 2009 1290299000 2010 1303110000 2011 1274029000 2012 1195808000 2013 1248229000 2014 1286020000 2015 1330547000 2016 1344359000