Year US Dollars 1970 0 1971 0 1972 0 1973 0 1974 0 1975 0 1976 0 1977 2183000 1978 10316000 1979 16719000 1980 23460000 1981 34421000 1982 37836000 1983 43793000 1984 54044000 1985 62646000 1986 78920000 1987 97673000 1988 109171000 1989 134446000 1990 150046000 1991 167713000 1992 189843000 1993 209812000 1994 222778000 1995 245656000 1996 235378000 1997 238210000 1998 258263000 1999 321784000 2000 304832000 2001 308356000 2002 333451000 2003 339962000 2004 361057000 2005 335608000 2006 351557000 2007 166185000 2008 131726000 2009 157003000 2010 181090000 2011 230970000 2012 201622000 2013 214377000 2014 212946000 2015 249357000 2016 247976000