Year	US Dollars, Sum Over Component Sub-periods
1994-01-01	3500000000
1995-01-01	4278000000
1996-01-01	4333000000
1997-01-01	4366000000
1998-01-01	4301000000
1999-01-01	3881000000
2000-01-01	4753000000
2001-01-01	6800000000
2002-01-01	5677000000
2003-01-01	11057000000
2004-01-01	11998000000
2005-01-01	17475000000
2006-01-01	29757000000
2007-01-01	47397000000
2008-01-01	61778000000
2009-01-01	33184000000
2010-01-01	37361000000
2011-01-01	42376000000