Year	US Dollars, Sum Over Component Sub-periods
1998-01-01	46600000000
1999-01-01	36000000000
2000-01-01	34500000000
2001-01-01	34000000000
2002-01-01	44200000000
2003-01-01	44400000000
2004-01-01	59000000000
2005-01-01	134200000000
2006-01-01	217700000000
2007-01-01	315900000000
2008-01-01	360600000000
2009-01-01	249500000000
2010-01-01	254200000000
2011-01-01	243600000000
2012-01-01	321500000000