Quarter	Billions of US Dollars
1989-10-01	21.123
1990-01-01	20.795
1990-04-01	19.954
1990-07-01	20.158
1990-10-01	23.792
1991-01-01	21.550
1991-04-01	20.344
1991-07-01	20.361
1991-10-01	29.438
1992-01-01	27.956
1992-04-01	27.498
1992-07-01	27.555
1992-10-01	30.086
1993-01-01	30.042
1993-04-01	29.646
1993-07-01	29.035
1993-10-01	27.956
1994-01-01	28.116
1994-04-01	27.523
1994-07-01	27.706
1994-10-01	29.626
1995-01-01	30.063
1995-04-01	31.118
1995-07-01	32.851
1995-10-01	33.568
1996-01-01	34.963
1996-04-01	34.744
1996-07-01	36.242
1996-10-01	37.763
1997-01-01	38.706
1997-04-01	37.385
1997-07-01	39.539
1997-10-01	38.117
1998-01-01	36.930
1998-04-01	36.411
1998-07-01	36.316
1998-10-01	35.141
1999-01-01	36.048
1999-04-01	36.351
1999-07-01	35.365
1999-10-01	37.337
2000-01-01	39.351
2000-04-01	38.720
2000-07-01	39.015
2000-10-01	38.919
2001-01-01	38.497
2001-04-01	40.218
2001-07-01	39.065
2001-10-01	40.986
2002-01-01	40.254
2002-04-01	38.732
2002-07-01	38.450
2002-10-01	41.611
2003-01-01	44.449
2003-04-01	51.645
2003-07-01	50.257
2003-10-01	53.135
2004-01-01	52.209
2004-04-01	53.003
2004-07-01	54.582
2004-10-01	58.700
2005-01-01	58.948
2005-04-01	56.531
2005-07-01	58.074
2005-10-01	56.788
2006-01-01	57.855
2006-04-01	57.146
2006-07-01	60.099
2006-10-01	62.751
2007-01-01	64.737
2007-04-01	59.649
2007-07-01	65.364
2007-10-01	70.528
2008-01-01	77.088
2008-04-01	86.752
2008-07-01	87.608
2008-10-01	82.601
2009-01-01	77.838
2009-04-01	86.382
2009-07-01	95.842
2009-10-01	96.557
2010-01-01	98.837
2010-04-01	95.063
2010-07-01	102.128
2010-10-01	107.522
2011-01-01	108.250
2011-04-01	109.447
2011-07-01	104.345
2011-10-01	104.704
2012-01-01	108.284
2012-04-01	105.116
2012-07-01	109.481
2012-10-01	121.639
2013-01-01	124.298
2013-04-01	128.747
2013-07-01	132.869
2013-10-01	136.780
2014-01-01	137.923
2014-04-01	143.319
2014-07-01	133.899
2014-10-01	127.228
2015-01-01	128.528