Quarter	Billions of US Dollars
1999-01-01	26.778
1999-04-01	26.817
1999-07-01	28.179
1999-10-01	27.401
2000-01-01	27.683
2000-04-01	27.800
2000-07-01	25.928
2000-10-01	27.918
2001-01-01	29.429
2001-04-01	30.706
2001-07-01	35.642
2001-10-01	36.864
2002-01-01	36.991
2002-04-01	43.158
2002-07-01	43.689
2002-10-01	47.983
2003-01-01	53.523
2003-04-01	61.330
2003-07-01	66.822
2003-10-01	78.267
2004-01-01	75.437
2004-04-01	74.703
2004-07-01	75.924
2004-10-01	83.175
2005-01-01	79.453
2005-04-01	74.677
2005-07-01	75.039
2005-10-01	73.976
2006-01-01	79.057
2006-04-01	86.325
2006-07-01	89.139
2006-10-01	96.272
2007-01-01	115.677
2007-04-01	134.646
2007-07-01	159.473
2007-10-01	184.495
2008-01-01	198.646
2008-04-01	198.753
2008-07-01	181.237
2008-10-01	176.048
2009-01-01	173.781
2009-04-01	191.488
2009-07-01	205.228
2009-10-01	203.529
2010-01-01	190.071
2010-04-01	172.291
2010-07-01	191.132
2010-10-01	186.661
2011-01-01	200.897
2011-04-01	212.370
2011-07-01	201.671
2011-10-01	198.053
2012-01-01	212.191
2012-04-01	203.246
2012-07-01	212.824
2012-10-01	219.477
2013-01-01	216.014
2013-04-01	223.859
2013-07-01	235.889
2013-10-01	244.330
2014-01-01	251.966
2014-04-01	252.987
2014-07-01	240.154
2014-10-01	237.329
2015-01-01	220.574
2015-04-01	235.001
2015-07-01	241.786
2015-10-01	240.677
2016-01-01	252.170
2016-04-01	243.769
2016-07-01	246.559
2016-10-01	235.427
2017-01-01	243.042
2017-04-01	259.815
2017-07-01	270.193
2017-10-01	273.244
2018-01-01	272.691