Year US Dollars 1970 205548000 1971 230545000 1972 277866000 1973 282879000 1974 419354000 1975 491364000 1976 567664000 1977 813717000 1978 998401000 1979 973790000 1980 996825000 1981 1219727000 1982 1535579000 1983 1840051000 1984 1927866000 1985 1947464000 1986 1955291000 1987 2073825000 1988 2098775000 1989 2171658000 1990 2232090000 1991 2272549000 1992 2346755000 1993 1992936000 1994 2163864000 1995 2569442000 1996 2872514000 1997 3203307000 1998 3310665000 1999 3762996000 2000 4535063000 2001 5344552000 2002 5858922000 2003 8357302000 2004 8866835000 2005 9689271000 2006 10155645000 2007 9830793000 2008 10650668000 2009 10368173000 2010 11059769000 2011 11995548000 2012 13035228000 2013 13539238000 2014 14532672000 2015 14913049000 2016 15424892000