Quarter	Billions of US Dollars
1989-07-01	0.479
1989-10-01	0.380
1990-01-01	0.753
1990-04-01	0.851
1990-07-01	1.699
1990-10-01	1.873
1991-01-01	2.741
1991-04-01	2.610
1991-07-01	2.533
1991-10-01	2.206
1992-01-01	2.928
1992-04-01	2.892
1992-07-01	2.266
1992-10-01	1.760
1993-01-01	2.266
1993-04-01	3.206
1993-07-01	3.229
1993-10-01	3.829
1994-01-01	4.023
1994-04-01	3.348
1994-07-01	3.422
1994-10-01	4.328
1995-01-01	4.193
1995-04-01	4.129
1995-07-01	5.186
1995-10-01	5.782
1996-01-01	7.608
1996-04-01	7.407
1996-07-01	6.923
1996-10-01	7.969
1997-01-01	9.895
1997-04-01	9.649
1997-07-01	9.452
1997-10-01	11.690
1998-01-01	11.794
1998-04-01	13.068
1998-07-01	13.819
1998-10-01	13.895
1999-01-01	14.338
1999-04-01	17.216
1999-07-01	18.792
1999-10-01	20.987
2000-01-01	22.774
2000-04-01	22.340
2000-07-01	22.431
2000-10-01	25.275
2001-01-01	26.861
2001-04-01	30.257
2001-07-01	27.989
2001-10-01	27.988
2002-01-01	29.747
2002-04-01	37.910
2002-07-01	38.410
2002-10-01	38.795
2003-01-01	46.715
2003-04-01	53.812
2003-07-01	50.810
2003-10-01	61.042
2004-01-01	60.523
2004-04-01	62.616
2004-07-01	64.866
2004-10-01	80.385
2005-01-01	82.144
2005-04-01	90.804
2005-07-01	94.980
2005-10-01	98.945
2006-01-01	108.215
2006-04-01	110.692
2006-07-01	111.101
2006-10-01	119.864
2007-01-01	134.229
2007-04-01	138.702
2007-07-01	114.219
2007-10-01	105.420
2008-01-01	122.383
2008-04-01	120.818
2008-07-01	91.410
2008-10-01	104.746
2009-01-01	96.236
2009-04-01	101.071
2009-07-01	94.713
2009-10-01	80.169
2010-01-01	78.091
2010-04-01	67.435
2010-07-01	72.984
2010-10-01	74.868
2011-01-01	95.642
2011-04-01	101.366
2011-07-01	100.629
2011-10-01	111.492
2012-01-01	123.174
2012-04-01	104.300
2012-07-01	101.586
2012-10-01	99.049
2013-01-01	105.014
2013-04-01	106.458
2013-07-01	112.934
2013-10-01	104.389
2014-01-01	107.022
2014-04-01	111.980
2014-07-01	105.939
2014-10-01	103.769
2015-01-01	102.504
2015-04-01	102.183