Quarter	Billions of US Dollars
1988-04-01	373.395
1988-07-01	380.428
1988-10-01	419.401
1989-01-01	412.977
1989-04-01	397.786
1989-07-01	413.480
1989-10-01	430.965
1990-01-01	428.027
1990-04-01	451.061
1990-07-01	473.785
1990-10-01	453.152
1991-01-01	464.171
1991-04-01	458.734
1991-07-01	480.161
1991-10-01	463.569
1992-01-01	469.083
1992-04-01	461.426
1992-07-01	450.843
1992-10-01	440.050
1993-01-01	456.214
1993-04-01	433.850
1993-07-01	427.106
1993-10-01	455.605
1994-01-01	471.348
1994-04-01	495.693
1994-07-01	511.779
1994-10-01	546.801
1995-01-01	519.409
1995-04-01	520.851
1995-07-01	557.124
1995-10-01	564.526
1996-01-01	599.571
1996-04-01	612.478
1996-07-01	620.258
1996-10-01	638.384
1997-01-01	628.367
1997-04-01	612.139
1997-07-01	602.231
1997-10-01	558.456
1998-01-01	576.145
1998-04-01	547.211
1998-07-01	538.894
1998-10-01	563.766
1999-01-01	585.346
1999-04-01	614.753
1999-07-01	617.472
1999-10-01	628.821
2000-01-01	598.282
2000-04-01	613.675
2000-07-01	562.871
2000-10-01	596.463
2001-01-01	537.841
2001-04-01	560.893
2001-07-01	561.009
2001-10-01	581.860
2002-01-01	614.902
2002-04-01	674.111
2002-07-01	673.140
2002-10-01	708.968
2003-01-01	760.771
2003-04-01	867.135
2003-07-01	898.857
2003-10-01	1022.618
2004-01-01	1059.126
2004-04-01	995.107
2004-07-01	1060.229
2004-10-01	1183.605
2005-01-01	1199.493
2005-04-01	1231.284
2005-07-01	1272.777
2005-10-01	1270.191
2006-01-01	1263.104
2006-04-01	1362.952
2006-07-01	1416.992
2006-10-01	1540.786
2007-01-01	1618.652
2007-04-01	1767.761
2007-07-01	1911.411
2007-10-01	1952.696
2008-01-01	2076.954
2008-04-01	2246.356
2008-07-01	1928.233
2008-10-01	1683.738
2009-01-01	1713.032
2009-04-01	2027.671
2009-07-01	2220.051
2009-10-01	2295.193
2010-01-01	2367.847
2010-04-01	2255.560
2010-07-01	2601.556
2010-10-01	2746.896
2011-01-01	2849.777
2011-04-01	2994.598
2011-07-01	2809.377
2011-10-01	2983.921
2012-01-01	3101.777
2012-04-01	3105.329
2012-07-01	3223.924
2012-10-01	3243.832
2013-01-01	3286.362
2013-04-01	2971.359
2013-07-01	3056.237
2013-10-01	3006.768
2014-01-01	3141.537
2014-04-01	3267.620
2014-07-01	3097.674
2014-10-01	2978.602
2015-01-01	2849.374
2015-04-01	2910.128
2015-07-01	2734.312
2015-10-01	2859.604
2016-01-01	3064.868
2016-04-01	3008.139
2016-07-01	3112.393
2016-10-01	2967.419
2017-01-01	3161.025
2017-04-01	3227.880
2017-07-01	3298.128
2017-10-01	3336.181
2018-01-01	3315.738