Year US Dollars 1970 2595000 1971 2637000 1972 5369000 1973 6286000 1974 8216000 1975 12234000 1976 17255000 1977 19237000 1978 21045000 1979 20524000 1980 25820000 1981 19836000 1982 24411000 1983 33566000 1984 62017000 1985 95976000 1986 119265000 1987 154397000 1988 158288000 1989 131250000 1990 155289000 1991 204847000 1992 219981000 1993 232492000 1994 257656000 1995 272438000 1996 287625000 1997 262660000 1998 279005000 1999 269330000 2000 297695000 2001 299614000 2002 358434000 2003 395028000 2004 459647000 2005 486492000 2006 566133000 2007 812247000 2008 846327000 2009 897022000 2010 778534000 2011 779098000 2012 811674000 2013 828276000 2014 949533000 2015 1233236000 2016 1706359000