Quarter	Billions of US Dollars
1999-01-01	28.736
1999-04-01	28.680
1999-07-01	30.067
1999-10-01	29.103
2000-01-01	29.258
2000-04-01	29.368
2000-07-01	27.382
2000-10-01	29.536
2001-01-01	30.927
2001-04-01	32.149
2001-07-01	37.212
2001-10-01	38.457
2002-01-01	38.527
2002-04-01	44.929
2002-07-01	45.459
2002-10-01	49.871
2003-01-01	55.418
2003-04-01	63.374
2003-07-01	68.956
2003-10-01	80.590
2004-01-01	77.529
2004-04-01	76.832
2004-07-01	78.184
2004-10-01	85.987
2005-01-01	82.072
2005-04-01	77.083
2005-07-01	77.514
2005-10-01	76.600
2006-01-01	81.965
2006-04-01	89.437
2006-07-01	92.325
2006-10-01	99.735
2007-01-01	119.201
2007-04-01	138.480
2007-07-01	163.501
2007-10-01	188.715
2008-01-01	203.515
2008-04-01	203.677
2008-07-01	185.718
2008-10-01	184.020
2009-01-01	181.307
2009-04-01	199.530
2009-07-01	213.780
2009-10-01	212.035
2010-01-01	198.270
2010-04-01	182.368
2010-07-01	202.511
2010-10-01	197.459
2011-01-01	212.441
2011-04-01	224.284
2011-07-01	213.020
2011-10-01	208.882
2012-01-01	225.157
2012-04-01	215.817
2012-07-01	225.848
2012-10-01	232.877
2013-01-01	230.120
2013-04-01	238.331
2013-07-01	253.775
2013-10-01	259.791
2014-01-01	267.617
2014-04-01	268.800
2014-07-01	254.986
2014-10-01	252.175
2015-01-01	233.981
2015-04-01	248.620
2015-07-01	255.559
2015-10-01	254.119
2016-01-01	266.691
2016-04-01	257.804
2016-07-01	260.567
2016-10-01	248.082
2017-01-01	257.685
2017-04-01	275.166
2017-07-01	286.246
2017-10-01	289.423
2018-01-01	288.962