Quarter	Billions of US Dollars
1994-01-01	9.459
1994-04-01	10.318
1994-07-01	11.017
1994-10-01	11.261
1995-01-01	11.778
1995-04-01	11.374
1995-07-01	10.914
1995-10-01	11.076
1996-01-01	11.342
1996-04-01	11.618
1996-07-01	11.953
1996-10-01	12.648
1997-01-01	13.367
1997-04-01	13.967
1997-07-01	14.420
1997-10-01	15.772
1998-01-01	17.075
1998-04-01	17.894
1998-07-01	19.149
1998-10-01	19.810
1999-01-01	19.613
1999-04-01	19.365
1999-07-01	19.519
1999-10-01	19.946
2000-01-01	19.975
2000-04-01	20.344
2000-07-01	20.287
2000-10-01	20.318
2001-01-01	20.395
2001-04-01	20.423
2001-07-01	19.655
2001-10-01	17.790
2002-01-01	5.056
2002-04-01	3.481
2002-07-01	3.228
2002-10-01	3.444
2003-01-01	3.516
2003-04-01	3.606
2003-07-01	3.437
2003-10-01	3.532
2004-01-01	3.680
2004-04-01	3.742
2004-07-01	3.997
2004-10-01	4.347
2005-01-01	4.724
2005-04-01	5.114
2005-07-01	5.468
2005-10-01	6.005
2006-01-01	6.431
2006-04-01	7.078
2006-07-01	7.749
2006-10-01	8.844
2007-01-01	9.647
2007-04-01	10.749
2007-07-01	11.854
2007-10-01	13.312
2008-01-01	14.407
2008-04-01	16.445
2008-07-01	16.643
2008-10-01	16.192
2009-01-01	14.988
2009-04-01	14.800
2009-07-01	14.825
2009-10-01	16.031
2010-01-01	16.298
2010-04-01	17.167
2010-07-01	18.273
2010-10-01	20.205
2011-01-01	21.148
2011-04-01	23.104
2011-07-01	24.798
2011-10-01	27.091
2012-01-01	28.239
2012-04-01	29.521
2012-07-01	29.823
2012-10-01	31.545
2013-01-01	31.902
2013-04-01	32.406
2013-07-01	32.226
2013-10-01	31.799
2014-01-01	26.827
2014-04-01	27.201
2014-07-01	27.489
2014-10-01	30.938
2015-01-01	31.734
2015-04-01	32.976
2015-07-01	34.931
2015-10-01	29.214
2016-01-01	26.598
2016-04-01	27.586
2016-07-01	28.362
2016-10-01	30.765
2017-01-01	34.123
2017-04-01	34.481
2017-07-01	36.124
2017-10-01	38.940
2018-01-01	40.756