Quarter	Billions of US Dollars
1992-01-01	22.538
1992-04-01	23.801
1992-07-01	24.210
1992-10-01	21.646
1993-01-01	21.581
1993-04-01	21.534
1993-07-01	20.602
1993-10-01	20.343
1994-01-01	20.886
1994-04-01	21.536
1994-07-01	21.725
1994-10-01	22.318
1995-01-01	24.329
1995-04-01	26.673
1995-07-01	28.047
1995-10-01	30.316
1996-01-01	30.789
1996-04-01	31.660
1996-07-01	33.952
1996-10-01	38.053
1997-01-01	38.345
1997-04-01	38.181
1997-07-01	39.206
1997-10-01	40.201
1998-01-01	45.144
1998-04-01	48.916
1998-07-01	52.464
1998-10-01	57.851
1999-01-01	53.686
1999-04-01	56.746
1999-07-01	58.051
1999-10-01	59.415
2000-01-01	62.062
2000-04-01	65.687
2000-07-01	63.668
2000-10-01	71.399
2001-01-01	74.847
2001-04-01	78.733
2001-07-01	78.709
2001-10-01	83.387
2002-01-01	83.520
2002-04-01	90.333
2002-07-01	93.803
2002-10-01	103.697
2003-01-01	100.028
2003-04-01	102.970
2003-07-01	102.833
2003-10-01	108.829
2004-01-01	107.857
2004-04-01	112.302
2004-07-01	118.498
2004-10-01	133.061
2005-01-01	126.487
2005-04-01	122.755
2005-07-01	128.288
2005-10-01	131.118
2006-01-01	135.804
2006-04-01	147.373
2006-07-01	160.141
2006-10-01	183.640
2007-01-01	192.228
2007-04-01	213.593
2007-07-01	241.199
2007-10-01	276.568
2008-01-01	319.708
2008-04-01	351.616
2008-07-01	336.298
2008-10-01	300.336
2009-01-01	274.051
2009-04-01	304.697
2009-07-01	333.239
2009-10-01	334.826
2010-01-01	337.227
2010-04-01	301.219
2010-07-01	351.351
2010-10-01	353.102
2011-01-01	375.907
2011-04-01	396.211
2011-07-01	357.112
2011-10-01	348.278
2012-01-01	386.348
2012-04-01	363.314
2012-07-01	388.770
2012-10-01	404.013
2013-01-01	386.588
2013-04-01	390.064
2013-07-01	416.743
2013-10-01	432.938
2014-01-01	438.397
2014-04-01	447.191
2014-07-01	417.889
2014-10-01	399.381
2015-01-01	377.980
2015-04-01	391.585
2015-07-01	393.309
2015-10-01	383.156
2016-01-01	407.054
2016-04-01	388.683
2016-07-01	401.487
2016-10-01	383.089
2017-01-01	404.344
2017-04-01	433.624
2017-07-01	442.787
2017-10-01	463.245
2018-01-01	481.497