Year US Dollars 1970 135210000 1971 152211000 1972 175659000 1973 215017000 1974 242454000 1975 270144000 1976 309344000 1977 460544000 1978 594683000 1979 668974000 1980 830101000 1981 821554000 1982 864821000 1983 892448000 1984 879967000 1985 1020832000 1986 1157321000 1987 1366792000 1988 1359049000 1989 1410111000 1990 1558244000 1991 1664944000 1992 1708912000 1993 1826230000 1994 2021057000 1995 2238777000 1996 2311682000 1997 2225558000 1998 2438888000 1999 2757064000 2000 2716143000 2001 2591701000 2002 2900922000 2003 3111211000 2004 3443610000 2005 3196003000 2006 870593000 2007 868791000 2008 994624000 2009 1144299000 2010 1020633000 2011 1213419000 2012 1329036000 2013 1560301000 2014 1658234000 2015 1734424000 2016 1846561000