Year	US Dollars, Sum Over Component Sub-periods
1997-01-01	241392487409.826
1998-01-01	262827447490.934
1999-01-01	274199259502.606
2000-01-01	276455264572.614
2001-01-01	285509459308.183
2002-01-01	294529090223.674
2003-01-01	347187602971.220
2004-01-01	412938508847.313
2005-01-01	455553829423.645
2006-01-01	501493661353.081
2007-01-01	612210953809.649
2008-01-01	689088051463.869
2009-01-01	632087708533.522
2010-01-01	645529937641.411
2011-01-01	708349015063.731
2012-01-01	675254171932.906