Quarter	Billions of US Dollars
1983-01-01	10.237
1983-04-01	9.952
1983-07-01	9.562
1983-10-01	9.654
1984-01-01	9.980
1984-04-01	9.825
1984-07-01	8.890
1984-10-01	9.333
1985-01-01	8.919
1985-04-01	8.206
1985-07-01	8.067
1985-10-01	7.982
1986-01-01	8.093
1986-04-01	8.008
1986-07-01	8.108
1986-10-01	8.325
1987-01-01	8.418
1987-04-01	8.538
1987-07-01	8.769
1987-10-01	8.936
1988-01-01	8.982
1988-04-01	9.238
1988-07-01	10.078
1988-10-01	10.801
1989-01-01	11.051
1989-04-01	10.855
1989-07-01	11.532
1989-10-01	12.027
1990-01-01	12.593
1990-04-01	12.839
1990-07-01	12.808
1990-10-01	12.803
1991-01-01	12.681
1991-04-01	13.038
1991-07-01	13.636
1991-10-01	14.229
1992-01-01	15.985
1992-04-01	16.519
1992-07-01	17.263
1992-10-01	18.854
1993-01-01	19.095
1993-04-01	20.131
1993-07-01	21.116
1993-10-01	21.673
1994-01-01	22.428
1994-04-01	23.386
1994-07-01	25.029
1994-10-01	26.804
1995-01-01	28.214
1995-04-01	31.475
1995-07-01	32.249
1995-10-01	34.002
1996-01-01	35.088
1996-04-01	36.515
1996-07-01	37.736
1996-10-01	39.330
1997-01-01	41.684
1997-04-01	42.996
1997-07-01	45.070
1997-10-01	45.462
1998-01-01	45.973
1998-04-01	46.946
1998-07-01	47.311
1998-10-01	46.459
1999-01-01	45.917
1999-04-01	43.137
1999-07-01	43.379
1999-10-01	44.338
2000-01-01	47.793
2000-04-01	45.367
2000-07-01	43.847
2000-10-01	45.425
2001-01-01	44.364
2001-04-01	43.161
2001-07-01	40.125
2001-10-01	42.568
2002-01-01	42.776
2002-04-01	40.779
2002-07-01	39.539
2002-10-01	41.801
2003-01-01	41.747
2003-04-01	43.732
2003-07-01	46.278
2003-10-01	51.977
2004-01-01	51.151
2004-04-01	51.771
2004-07-01	56.256
2004-10-01	63.196
2005-01-01	62.737
2005-04-01	65.501
2005-07-01	74.050
2005-10-01	81.000
2006-01-01	81.842
2006-04-01	82.180
2006-07-01	86.877
2006-10-01	91.022
2007-01-01	93.635
2007-04-01	99.505
2007-07-01	108.309
2007-10-01	118.690
2008-01-01	137.915
2008-04-01	122.392
2008-07-01	120.376
2008-10-01	111.062
2009-01-01	116.185
2009-04-01	126.080
2009-07-01	123.885
2009-10-01	136.009
2010-01-01	130.201
2010-04-01	130.435
2010-07-01	148.128
2010-10-01	157.538
2011-01-01	158.932
2011-04-01	169.316
2011-07-01	162.121
2011-10-01	165.451
2012-01-01	181.052
2012-04-01	181.541
2012-07-01	199.253
2012-10-01	202.051
2013-01-01	208.058
2013-04-01	201.611
2013-07-01	206.536
2013-10-01	203.501
2014-01-01	197.577
2014-04-01	201.654
2014-07-01	189.411
2014-10-01	193.715
2015-01-01	189.551
2015-04-01	192.344
2015-07-01	179.919
2015-10-01	184.444
2016-01-01	194.822
2016-04-01	201.991
2016-07-01	205.191
2016-10-01	205.794
2017-01-01	209.205
2017-04-01	211.266
2017-07-01	222.735
2017-10-01	234.162
2018-01-01	242.358