Year current US$ 1990 19999.9995529652 1991 19999.9995529652 1992 19999.9995529652 1993 9999.99977648258 1994 9999.99977648258 1995 9999.99977648258 1996 19999.9995529652 1997 19999.9995529652 1998 19999.9995529652