Year	US Dollars, Sum Over Component Sub-periods
1998-01-01	23900000000
1999-01-01	26200000000
2000-01-01	30400000000
2001-01-01	33300000000
2002-01-01	39700000000
2003-01-01	46800000000
2004-01-01	64900000000
2005-01-01	74400000000
2006-01-01	92000000000
2007-01-01	122200000000
2008-01-01	147100000000
2009-01-01	129500000000
2010-01-01	162200000000
2011-01-01	186100000000
2012-01-01	191500000000