Quarter	Billions of US Dollars
2006-01-01	28.116
2006-04-01	28.388
2006-07-01	29.800
2006-10-01	24.109
2007-01-01	30.599
2007-04-01	29.695
2007-07-01	32.570
2007-10-01	33.917
2008-01-01	45.422
2008-04-01	48.820
2008-07-01	41.756
2008-10-01	28.740
2009-01-01	34.843
2009-04-01	38.287
2009-07-01	42.083
2009-10-01	39.087
2010-01-01	39.230
2010-04-01	34.216
2010-07-01	39.395
2010-10-01	36.329
2011-01-01	42.588
2011-04-01	43.400
2011-07-01	38.912
2011-10-01	36.185
2012-01-01	41.414
2012-04-01	38.640
2012-07-01	41.235
2012-10-01	41.374
2013-01-01	41.504
2013-04-01	40.820
2013-07-01	43.248
2013-10-01	49.012
2014-01-01	51.213
2014-04-01	50.123
2014-07-01	47.039
2014-10-01	36.587
2015-01-01	34.420