Quarter	Billions of US Dollars
1990-10-01	103.349
1991-01-01	102.512
1991-04-01	96.172
1991-07-01	99.570
1991-10-01	101.926
1992-01-01	104.587
1992-04-01	109.656
1992-07-01	112.285
1992-10-01	110.838
1993-01-01	120.371
1993-04-01	122.301
1993-07-01	126.775
1993-10-01	129.566
1994-01-01	135.811
1994-04-01	142.200
1994-07-01	147.089
1994-10-01	150.742
1995-01-01	156.363
1995-04-01	163.081
1995-07-01	164.238
1995-10-01	167.755
1996-01-01	172.487
1996-04-01	180.994
1996-07-01	185.538
1996-10-01	192.098
1997-01-01	203.725
1997-04-01	218.111
1997-07-01	225.023
1997-10-01	224.908
1998-01-01	219.673
1998-04-01	216.191
1998-07-01	212.465
1998-10-01	202.176
1999-01-01	194.150
1999-04-01	179.883
1999-07-01	176.015
1999-10-01	172.824
2000-01-01	172.091
2000-04-01	168.108
2000-07-01	178.366
2000-10-01	171.859
2001-01-01	172.434
2001-04-01	167.149
2001-07-01	164.401
2001-10-01	160.424
2002-01-01	158.014
2002-04-01	154.834
2002-07-01	152.647
2002-10-01	152.212
2003-01-01	152.758
2003-04-01	156.745
2003-07-01	157.334
2003-10-01	158.552
2004-01-01	164.480
2004-04-01	165.356
2004-07-01	168.811
2004-10-01	176.097
2005-01-01	179.699
2005-04-01	192.360
2005-07-01	195.008
2005-10-01	201.084
2006-01-01	206.030
2006-04-01	214.627
2006-07-01	220.460
2006-10-01	223.097
2007-01-01	237.805
2007-04-01	257.372
2007-07-01	275.539
2007-10-01	265.728
2008-01-01	280.866
2008-04-01	293.612
2008-07-01	301.920
2008-10-01	286.397
2009-01-01	271.726
2009-04-01	281.101
2009-07-01	284.223
2009-10-01	274.389
2010-01-01	292.896
2010-04-01	316.830
2010-07-01	352.644
2010-10-01	352.478
2011-01-01	389.563
2011-04-01	407.562
2011-07-01	420.389
2011-10-01	412.381
2012-01-01	426.778
2012-04-01	429.473
2012-07-01	434.664
2012-10-01	435.377
2013-01-01	458.425
2013-04-01	497.546
2013-07-01	517.783
2013-10-01	515.807
2014-01-01	560.066
2014-04-01	597.917
2014-07-01	604.168
2014-10-01	597.606
2015-01-01	637.857
2015-04-01	637.540
2015-07-01	632.219
2015-10-01	630.510
2016-01-01	635.052
2016-04-01	643.488
2016-07-01	654.313
2016-10-01	678.513
2017-01-01	711.560
2017-04-01	755.684
2017-07-01	770.552
2017-10-01	790.591
2018-01-01	812.781