Year	US Dollars, Sum Over Component Sub-periods
1990-01-01	2885000000
1991-01-01	2525000000
1992-01-01	3406000000
1993-01-01	2837000000
1994-01-01	3117000000
1995-01-01	4271000000
1996-01-01	5004000000
1997-01-01	5728000000
1998-01-01	5919000000
1999-01-01	5647000000
2000-01-01	5611400000
2001-01-01	6645000000
2002-01-01	6897300000
2003-01-01	7979200000
2004-01-01	10254900000
2005-01-01	12860900000
2006-01-01	13704600000
2007-01-01	17282100000
2008-01-01	20240000000
2009-01-01	18604300000
2010-01-01	19326500000
2011-01-01	22035300000
2012-01-01	20473400000
2013-01-01	21530400000