Year US Dollars 1970 14970000 1971 13628000 1972 6895000 1973 7780000 1974 9438000 1975 19380000 1976 22364000 1977 47222000 1978 74680000 1979 136188000 1980 165720000 1981 178613000 1982 227433000 1983 307725000 1984 348005000 1985 455098000 1986 570431000 1987 769580000 1988 800692000 1989 888847000 1990 906937000 1991 963470000 1992 1026584000 1993 1065650000 1994 1127405000 1995 1161955000 1996 1130743000 1997 1068958000 1998 1121832000 1999 1153730000 2000 1125866000 2001 1093541000 2002 1232211000 2003 1348343000 2004 1357933000 2005 1287890000 2006 1371906000 2007 1409727000 2008 1390284000 2009 607228000 2010 620920000 2011 604411000 2012 667316000 2013 683609000 2014 690170000 2015 625980000 2016 632780000