Quarter	Billions of US Dollars
1972-01-01	0.0490
1972-04-01	0.1268
1972-07-01	0.1565
1972-10-01	0.2423
1973-01-01	0.2423
1973-04-01	0.3778
1973-07-01	0.4156
1973-10-01	0.7105
1974-01-01	0.8042
1974-04-01	1.1674
1974-07-01	1.1978
1974-10-01	1.2702
1975-01-01	1.3342
1975-04-01	1.3917
1975-07-01	1.4372
1975-10-01	1.4372
1976-01-01	1.4980
1976-04-01	1.5539
1976-07-01	1.6208
1976-10-01	1.7877
1977-01-01	1.9048
1977-04-01	1.9565
1977-07-01	2.0599
1977-10-01	2.1277
1978-01-01	2.1922
1978-04-01	2.3208
1978-07-01	2.3832
1978-10-01	2.5532
1979-01-01	2.6632
1979-04-01	2.7382
1979-07-01	2.7382
1979-10-01	2.7532
1980-01-01	2.7532
1980-04-01	2.7532
1980-07-01	2.8432
1980-10-01	2.8832
1981-01-01	2.8902
1981-04-01	2.9052
1981-07-01	2.9852
1981-10-01	2.9852
1982-01-01	2.9852
1982-04-01	3.0602
1982-07-01	3.0602
1982-10-01	3.0602
1983-01-01	3.0602
1983-04-01	3.0852
1983-07-01	3.1452
1983-10-01	3.0352
1984-01-01	2.9252
1984-04-01	2.9174
1984-07-01	2.8874
1984-10-01	2.8724
1985-01-01	2.8724
1985-04-01	2.7369
1985-07-01	2.6491
1985-10-01	2.3062
1986-01-01	2.2055
1986-04-01	2.1273
1986-07-01	2.1519
1986-10-01	2.0250
1987-01-01	1.9320
1987-04-01	1.7895
1987-07-01	1.6793
1987-10-01	1.5935
1988-01-01	1.5327
1988-04-01	1.4018
1988-07-01	1.3049
1988-10-01	1.2268
1989-01-01	1.1097
1989-04-01	0.9341
1989-07-01	0.9341
1989-10-01	0.8663
1990-01-01	0.8018
1990-04-01	0.7232
1990-07-01	0.5808
1990-10-01	0.5288
1991-01-01	0.5288
1991-04-01	1.4778
1991-07-01	1.4778
1991-10-01	1.4778
1992-01-01	1.5178
1992-04-01	1.5208
1992-07-01	1.5178
1992-10-01	1.5118
1993-01-01	1.5088
1993-04-01	1.5108
1993-07-01	1.5278
1993-10-01	1.5278
1994-01-01	1.5078
1994-04-01	1.2078
1994-07-01	1.1928
1994-10-01	1.1928
1995-01-01	1.1928
1995-04-01	1.1928
1995-07-01	1.1928
1995-10-01	1.3040
1996-01-01	1.3040
1996-04-01	1.3040
1996-07-01	1.1990
1996-10-01	1.9990
1997-01-01	1.9990
1997-04-01	2.0740
1997-07-01	2.3543
1997-10-01	3.2429
1998-01-01	3.2405
1998-04-01	3.3396
1998-07-01	3.7123
1998-10-01	4.2500
1999-01-01	5.0397
1999-04-01	5.4515
1999-07-01	5.5580
1999-10-01	6.3077
2000-01-01	7.3050
2000-04-01	7.4921
2000-07-01	7.8877
2000-10-01	8.0107
2001-01-01	8.2106
2001-04-01	8.8841
2001-07-01	9.3080
2001-10-01	9.3983
2002-01-01	9.9790
2002-04-01	10.2134
2002-07-01	10.2398
2002-10-01	10.7739
2003-01-01	11.0213
2003-04-01	12.0470
2003-07-01	12.2460
2003-10-01	13.1606
2004-01-01	14.4178
2004-04-01	15.3932
2004-07-01	15.4167
2004-10-01	16.1594
2005-01-01	15.6666
2005-04-01	15.2105
2005-07-01	14.7185
2005-10-01	15.4265
2006-01-01	16.3714
2006-04-01	15.8135
2006-07-01	15.8013
2006-10-01	16.1994
2007-01-01	15.9235
2007-04-01	16.1090
2007-07-01	15.6375
2007-10-01	15.5080
2008-01-01	15.8079
2008-04-01	17.7319
2008-07-01	17.6283
2008-10-01	17.5193
2009-01-01	18.0990
2009-04-01	18.1218
2009-07-01	18.2350
2009-10-01	17.6224
2010-01-01	19.0785
2010-04-01	20.4915
2010-07-01	20.6394
2010-10-01	20.6889
2011-01-01	20.7385
2011-04-01	20.4687
2011-07-01	20.3197
2011-10-01	25.0424
2012-01-01	27.3094
2012-04-01	28.0766
2012-07-01	28.2277
2012-10-01	33.1591
2013-01-01	34.0913
2013-04-01	32.2166
2013-07-01	33.0772
2013-10-01	32.7948
2014-01-01	34.3666
2014-04-01	35.8400
2014-07-01	35.2044
2014-10-01	38.2651
2015-01-01	42.5664
2015-04-01	41.9384