Year US Dollars 1991 -871531333.53964 1992 -843041915.36527 1993 -818949256.12468 1994 -741325584.26245 1995 -887838286.74343 1996 -849634466.7059 1997 -780501355.38233 1998 -930536116.21445 1999 -729509491.1585 2000 -666486367.6517