Quarter	Billions of US Dollars
1966-01-01	0.020
1966-04-01	0.020
1966-07-01	0.020
1966-10-01	0.020
1967-01-01	0.020
1967-04-01	0.020
1967-07-01	0.020
1967-10-01	0.035
1968-01-01	0.035
1968-04-01	0.035
1968-07-01	0.035
1968-10-01	0.035
1969-01-01	0.035
1969-04-01	0.035
1969-07-01	0.035
1969-10-01	0.035
1970-01-01	0.035
1970-04-01	0.035
1970-07-01	0.035
1970-10-01	0.035
1971-01-01	0.080
1971-04-01	0.101
1971-07-01	0.118
1971-10-01	0.118
1972-01-01	0.239
1972-04-01	0.270
1972-07-01	0.294
1972-10-01	0.360
1973-01-01	0.462
1973-04-01	0.540
1973-07-01	0.539
1973-10-01	0.553
1974-01-01	0.599
1974-04-01	0.646
1974-07-01	0.651
1974-10-01	0.767
1975-01-01	1.096
1975-04-01	1.474
1975-07-01	1.445
1975-10-01	1.785
1976-01-01	2.137
1976-04-01	2.310
1976-07-01	2.632
1976-10-01	3.102
1977-01-01	3.392
1977-04-01	3.820
1977-07-01	4.277
1977-10-01	4.985
1978-01-01	5.276
1978-04-01	5.708
1978-07-01	6.242
1978-10-01	6.291
1979-01-01	6.402
1979-04-01	7.275
1979-07-01	7.610
1979-10-01	7.950
1980-01-01	7.922
1980-04-01	9.363
1980-07-01	9.942
1980-10-01	10.220
1981-01-01	10.352
1981-04-01	10.150
1981-07-01	10.406
1981-10-01	11.140
1982-01-01	11.846
1982-04-01	11.634
1982-07-01	11.804
1982-10-01	12.784
1983-01-01	14.447
1983-04-01	13.939
1983-07-01	13.867
1983-10-01	14.874
1984-01-01	15.715
1984-04-01	17.271
1984-07-01	17.815
1984-10-01	19.292
1985-01-01	18.148
1985-04-01	21.079
1985-07-01	22.131
1985-10-01	21.386
1986-01-01	22.939
1986-04-01	24.441
1986-07-01	26.028
1986-10-01	25.899
1987-01-01	27.824
1987-04-01	27.972
1987-07-01	27.845
1987-10-01	29.867
1988-01-01	30.850
1988-04-01	29.824
1988-07-01	29.976
1988-10-01	31.612
1989-01-01	32.370
1989-04-01	31.681
1989-07-01	32.858
1989-10-01	35.748
1990-01-01	36.546
1990-04-01	36.624
1990-07-01	39.115
1990-10-01	39.379
1991-01-01	37.089
1991-04-01	37.349
1991-07-01	39.234
1991-10-01	40.133
1992-01-01	38.222
1992-04-01	41.894
1992-07-01	44.915
1992-10-01	43.446
1993-01-01	48.372
1993-04-01	56.666
1993-07-01	60.800
1993-10-01	63.195
1994-01-01	69.424
1994-04-01	78.540
1994-07-01	83.769
1994-10-01	84.135
1995-01-01	90.072
1995-04-01	92.638
1995-07-01	92.714
1995-10-01	90.947
1996-01-01	93.095
1996-04-01	92.410
1996-07-01	96.627
1996-10-01	94.914
1997-01-01	92.616
1997-04-01	93.819
1997-07-01	92.476
1997-10-01	88.017
1998-01-01	83.597
1998-04-01	83.366
1998-07-01	83.386
1998-10-01	82.034
1999-01-01	74.074
1999-04-01	76.102
1999-07-01	79.176
1999-10-01	80.071
2000-01-01	78.566
2000-04-01	78.838
2000-07-01	73.930
2000-10-01	72.459
2001-01-01	71.187
2001-04-01	73.406
2001-07-01	75.695
2001-10-01	75.912
2002-01-01	75.503
2002-04-01	87.156
2002-07-01	86.687
2002-10-01	90.231
2003-01-01	93.279
2003-04-01	99.979
2003-07-01	102.556
2003-10-01	111.215
2004-01-01	112.529
2004-04-01	111.767
2004-07-01	114.723
2004-10-01	125.373
2005-01-01	126.229
2005-04-01	127.926
2005-07-01	131.498
2005-10-01	130.498
2006-01-01	143.294
2006-04-01	150.403
2006-07-01	150.426
2006-10-01	165.010
2007-01-01	179.284
2007-04-01	199.470
2007-07-01	205.562
2007-10-01	213.198
2008-01-01	220.701
2008-04-01	239.240
2008-07-01	232.052
2008-10-01	225.303
2009-01-01	238.235
2009-04-01	279.657
2009-07-01	309.376
2009-10-01	318.356
2010-01-01	328.371
2010-04-01	304.136
2010-07-01	336.172
2010-10-01	340.303
2011-01-01	363.433
2011-04-01	380.983
2011-07-01	363.943
2011-10-01	352.658
2012-01-01	378.867
2012-04-01	378.871
2012-07-01	399.004
2012-10-01	414.584
2013-01-01	419.120
2013-04-01	431.755
2013-07-01	454.048
2013-10-01	457.945
2014-01-01	462.104
2014-04-01	456.855
2014-07-01	438.035
2014-10-01	428.591
2015-01-01	411.111
2015-04-01	425.955