Year US Dollars 1990 -410372650.39238 1991 -416888472.59262 1992 -525427260.87091 1993 -526660532.93915 1994 -451725802.18872 1995 -392742433.51926 1996 -447298822.71545 1997 -386023929.77466 1998 -549277380.92308 1999 -608630358.02967