Year US Dollars 1970 0 1971 0 1972 0 1973 0 1974 0 1975 0 1976 0 1977 0 1978 0 1979 0 1980 0 1981 3009000 1982 4076000 1983 10621000 1984 12938000 1985 15763000 1986 18236000 1987 23651000 1988 26778000 1989 30315000 1990 38218000 1991 34869000 1992 36227000 1993 40190000 1994 45581000 1995 48945000 1996 47880000 1997 48735000 1998 64166000 1999 87977000 2000 112263000 2001 122663000 2002 160584000 2003 161146000 2004 153931000 2005 100348000 2006 110584000 2007 127899000 2008 148881000 2009 153309000 2010 177677000 2011 178460000 2012 361231000 2013 221438000 2014 218394000 2015 217233000 2016 213109000