Year US Dollars 1970 55285000 1971 61994000 1972 63328000 1973 310167000 1974 363341000 1975 369679000 1976 388731000 1977 618201000 1978 973265000 1979 1281913000 1980 1523265000 1981 1727221000 1982 2058186000 1983 2339563000 1984 2345278000 1985 3033152000 1986 3721751000 1987 4340608000 1988 4353869000 1989 4193909000 1990 4684042000 1991 4840917000 1992 5356381000 1993 5314118000 1994 6541951000 1995 5734906000 1996 5173712000 1997 5461770000 1998 5510861000 1999 5907562000 2000 5875094000 2001 5728354000 2002 6357145000 2003 7063886000 2004 7058878000 2005 6674250000 2006 6845838000 2007 7668353000 2008 7526241000 2009 8104248000 2010 8216712000 2011 8191699000 2012 7840286000 2013 7251180000 2014 6266049000 2015 6657380000 2016 6453002000