Quarter	Billions of US Dollars
1980-07-01	0.0250
1980-10-01	0.0250
1981-01-01	0.0250
1981-04-01	0.0250
1981-07-01	0.0250
1981-10-01	0.0250
1982-01-01	0.0656
1982-04-01	0.0841
1982-07-01	0.0807
1982-10-01	0.0888
1983-01-01	0.0877
1983-04-01	0.1276
1983-07-01	0.1497
1983-10-01	0.1511
1984-01-01	0.1540
1984-04-01	0.1492
1984-07-01	0.1465
1984-10-01	0.2243
1985-01-01	0.3422
1985-04-01	0.4755
1985-07-01	0.8379
1985-10-01	1.0987
1986-01-01	1.5436
1986-04-01	2.0709
1986-07-01	2.5324
1986-10-01	2.6321
1987-01-01	3.0186
1987-04-01	3.1981
1987-07-01	3.4280
1987-10-01	4.2872
1988-01-01	4.4652
1988-04-01	4.4239
1988-07-01	4.6024
1988-10-01	5.0253
1989-01-01	4.8403
1989-04-01	4.6969
1989-07-01	4.8217
1989-10-01	4.7722
1990-01-01	4.5018
1990-04-01	4.5882
1990-07-01	4.9017
1990-10-01	5.0070
1991-01-01	4.7825
1991-04-01	4.8294
1991-07-01	5.1422
1991-10-01	5.4233
1992-01-01	5.0102
1992-04-01	5.3034
1992-07-01	5.7567
1992-10-01	5.5333
1993-01-01	5.5335
1993-04-01	6.2559
1993-07-01	7.6718
1993-10-01	7.6757
1994-01-01	9.4984
1994-04-01	10.1510
1994-07-01	11.4230
1994-10-01	11.8030
1995-01-01	12.4486
1995-04-01	12.6263
1995-07-01	12.2230
1995-10-01	11.8124
1996-01-01	11.4929
1996-04-01	11.1311
1996-07-01	12.4666
1996-10-01	12.5337
1997-01-01	12.8215
1997-04-01	14.7273
1997-07-01	14.4421
1997-10-01	14.5035
1998-01-01	14.4122
1998-04-01	13.3964
1998-07-01	12.7295
1998-10-01	13.9572
1999-01-01	13.2993
1999-04-01	13.4833
1999-07-01	13.5284
1999-10-01	13.5851
2000-01-01	13.1560
2000-04-01	13.1974
2000-07-01	12.8432
2000-10-01	12.6878
2001-01-01	12.3129
2001-04-01	13.6567
2001-07-01	12.3936
2001-10-01	12.3391
2002-01-01	13.1740
2002-04-01	12.3167
2002-07-01	11.8752
2002-10-01	10.9887
2003-01-01	10.7081
2003-04-01	10.7410
2003-07-01	10.7250
2003-10-01	11.8384
2004-01-01	10.9894
2004-04-01	10.4259
2004-07-01	10.9492
2004-10-01	14.1120
2005-01-01	13.8364
2005-04-01	13.4113
2005-07-01	14.6119
2005-10-01	15.5294
2006-01-01	15.3467
2006-04-01	14.7067
2006-07-01	14.1811
2006-10-01	14.1174
2007-01-01	14.9220
2007-04-01	16.9901
2007-07-01	18.2777
2007-10-01	18.6669
2008-01-01	19.5143
2008-04-01	19.5293
2008-07-01	21.6071
2008-10-01	20.0066
2009-01-01	19.9075
2009-04-01	19.5409
2009-07-01	20.5028
2009-10-01	21.3465
2010-01-01	21.2783
2010-04-01	20.8258
2010-07-01	19.9169
2010-10-01	21.9860
2011-01-01	22.6520
2011-04-01	24.5235
2011-07-01	25.0932
2011-10-01	25.7532
2012-01-01	26.8516
2012-04-01	34.5238
2012-07-01	36.6783
2012-10-01	39.0453
2013-01-01	40.8496
2013-04-01	43.0540
2013-07-01	44.6319
2013-10-01	48.8733
2014-01-01	50.0692
2014-04-01	53.2364
2014-07-01	55.1975
2014-10-01	75.0693
2015-01-01	74.0597
2015-04-01	76.4127