Year US Dollars adjusted for inflation) 1990 26380000000 1991 23460000000 1992 17510000000 1993 13170000000 1994 13160000000 1995 14230000000 1996 15480000000 1997 16670000000 1998 15260000000 1999 11790000000 2000 12470000000 2001 15680000000 2002 15860000000 2003 14940000000 2004 14810000000 2005 15410000000 2006 15860000000 2007 16690000000 2008 17570000000