Year	US Dollars, Sum Over Component Sub-periods
1998-01-01	26700000000
1999-01-01	31600000000
2000-01-01	36000000000
2001-01-01	39300000000
2002-01-01	46500000000
2003-01-01	55300000000
2004-01-01	72700000000
2005-01-01	84000000000
2006-01-01	100800000000
2007-01-01	130100000000
2008-01-01	158900000000
2009-01-01	158900000000
2010-01-01	193300000000
2011-01-01	247600000000
2012-01-01	281200000000