Quarter	Billions of US Dollars
2010-04-01	47.117
2010-07-01	56.009
2010-10-01	53.726
2011-01-01	61.782
2011-04-01	56.781
2011-07-01	49.655
2011-10-01	41.661
2012-01-01	46.374
2012-04-01	47.222
2012-07-01	53.100
2012-10-01	54.619
2013-01-01	51.517
2013-04-01	54.890
2013-07-01	58.174
2013-10-01	57.422
2014-01-01	56.206
2014-04-01	60.566
2014-07-01	58.555
2014-10-01	58.053
2015-01-01	55.384