Year US Dollars 1970 192905000 1971 219103000 1972 234065000 1973 280352000 1974 325354000 1975 396868000 1976 465475000 1977 744635000 1978 909888000 1979 1142204000 1980 1269754000 1981 1368802000 1982 1654445000 1983 1925688000 1984 2486022000 1985 2787415000 1986 2915606000 1987 2891485000 1988 2707895000 1989 2701289000 1990 2911022000 1991 2867142000 1992 2822949000 1993 2945014000 1994 3162187000 1995 3335546000 1996 3414092000 1997 3513160000 1998 3691418000 1999 3873235000 2000 3948028000 2001 4381822000 2002 4527094000 2003 5157578000 2004 8094354000 2005 9506427000 2006 10946173000 2007 12678186000 2008 13823079000 2009 14824424000 2010 15043075000 2011 16281342000 2012 15135294000 2013 17252625000 2014 19320935000 2015 20245919000 2016 21234013000