Year	US Dollars, Sum Over Component Sub-periods
1998-01-01	4300000000
1999-01-01	5000000000
2000-01-01	6300000000
2001-01-01	8500000000
2002-01-01	13000000000
2003-01-01	17400000000
2004-01-01	22900000000
2005-01-01	23800000000
2006-01-01	28000000000
2007-01-01	37000000000
2008-01-01	43200000000
2009-01-01	31700000000
2010-01-01	40800000000
2011-01-01	24600000000
2012-01-01	3500000000