Quarter	Billions of US Dollars
2006-01-01	29.830
2006-04-01	32.706
2006-07-01	33.416
2006-10-01	38.630
2007-01-01	38.565
2007-04-01	39.951
2007-07-01	42.482
2007-10-01	49.221
2008-01-01	52.077
2008-04-01	58.994
2008-07-01	50.616
2008-10-01	48.726
2009-01-01	45.060
2009-04-01	56.592
2009-07-01	61.680
2009-10-01	58.227
2010-01-01	58.216
2010-04-01	53.701
2010-07-01	67.079
2010-10-01	62.030
2011-01-01	73.103
2011-04-01	75.024
2011-07-01	71.632
2011-10-01	68.055
2012-01-01	76.455
2012-04-01	70.493
2012-07-01	75.705
2012-10-01	80.450
2013-01-01	81.640
2013-04-01	80.853
2013-07-01	83.025
2013-10-01	81.374
2014-01-01	81.247
2014-04-01	80.570
2014-07-01	74.078
2014-10-01	80.749
2015-01-01	72.071