Year	US Dollars, Sum Over Component Sub-periods
1998-01-01	31500000000
1999-01-01	21100000000
2000-01-01	20500000000
2001-01-01	17400000000
2002-01-01	35400000000
2003-01-01	43100000000
2004-01-01	68900000000
2005-01-01	132400000000
2006-01-01	231800000000
2007-01-01	353200000000
2008-01-01	420600000000
2009-01-01	243300000000
2010-01-01	237800000000
2011-01-01	136000000000
2012-01-01	193100000000