Year current US$ 1992 19999.9995529652 1993 90000.0035762787 1994 29999.999329447703 1996 0 1997 310000.002384186 2000 29999.999329447703 2001 19999.9995529652 2002 29999.999329447703 2013 140000.000596046 2018 19999.9995529652