Quarter	Billions of US Dollars
1966-01-01	0.015
1966-04-01	0.035
1966-07-01	0.035
1966-10-01	0.035
1967-01-01	0.035
1967-04-01	0.035
1967-07-01	0.035
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	0.047
1971-04-01	0.061
1971-07-01	0.062
1971-10-01	0.062
1972-01-01	0.063
1972-04-01	0.121
1972-07-01	0.136
1972-10-01	0.136
1973-01-01	0.179
1973-04-01	0.216
1973-07-01	0.233
1973-10-01	0.218
1974-01-01	0.227
1974-04-01	0.277
1974-07-01	0.274
1974-10-01	0.290
1975-01-01	0.318
1975-04-01	0.334
1975-07-01	0.362
1975-10-01	0.368
1976-01-01	0.483
1976-04-01	0.484
1976-07-01	0.492
1976-10-01	0.579
1977-01-01	0.717
1977-04-01	1.279
1977-07-01	1.348
1977-10-01	1.423
1978-01-01	1.584
1978-04-01	1.604
1978-07-01	2.014
1978-10-01	2.029
1979-01-01	1.987
1979-04-01	2.040
1979-07-01	2.288
1979-10-01	2.285
1980-01-01	2.138
1980-04-01	2.405
1980-07-01	2.380
1980-10-01	2.327
1981-01-01	2.130
1981-04-01	2.074
1981-07-01	2.113
1981-10-01	2.160
1982-01-01	2.236
1982-04-01	2.021
1982-07-01	1.987
1982-10-01	2.093
1983-01-01	1.951
1983-04-01	2.284
1983-07-01	2.186
1983-10-01	2.410
1984-01-01	2.330
1984-04-01	2.203
1984-07-01	2.057
1984-10-01	2.055
1985-01-01	2.064
1985-04-01	2.049
1985-07-01	2.278
1985-10-01	2.382
1986-01-01	2.450
1986-04-01	3.263
1986-07-01	3.474
1986-10-01	3.552
1987-01-01	4.070
1987-04-01	4.106
1987-07-01	4.563
1987-10-01	5.207
1988-01-01	6.020
1988-04-01	5.872
1988-07-01	6.561
1988-10-01	7.383
1989-01-01	7.922
1989-04-01	8.185
1989-07-01	8.796
1989-10-01	9.998
1990-01-01	10.310
1990-04-01	10.750
1990-07-01	12.128
1990-10-01	13.017
1991-01-01	12.935
1991-04-01	13.778
1991-07-01	14.629
1991-10-01	15.720
1992-01-01	15.740
1992-04-01	17.235
1992-07-01	18.235
1992-10-01	16.620
1993-01-01	16.228
1993-04-01	15.881
1993-07-01	17.639
1993-10-01	17.591
1994-01-01	18.105
1994-04-01	19.302
1994-07-01	20.206
1994-10-01	22.076
1995-01-01	24.579
1995-04-01	26.165
1995-07-01	27.563
1995-10-01	27.700
1996-01-01	27.998
1996-04-01	28.524
1996-07-01	30.547
1996-10-01	31.536
1997-01-01	29.466
1997-04-01	30.035
1997-07-01	30.662
1997-10-01	30.935
1998-01-01	31.701
1998-04-01	36.032
1998-07-01	38.180
1998-10-01	38.898
1999-01-01	39.088
1999-04-01	40.585
1999-07-01	46.719
1999-10-01	46.685
2000-01-01	46.336
2000-04-01	49.188
2000-07-01	47.618
2000-10-01	54.744
2001-01-01	64.170
2001-04-01	68.629
2001-07-01	77.440
2001-10-01	82.465
2002-01-01	87.538
2002-04-01	103.624
2002-07-01	102.963
2002-10-01	111.647
2003-01-01	121.673
2003-04-01	132.399
2003-07-01	139.557
2003-10-01	167.611
2004-01-01	168.721
2004-04-01	178.694
2004-07-01	183.335
2004-10-01	205.298
2005-01-01	210.035
2005-04-01	222.134
2005-07-01	245.486
2005-10-01	259.006
2006-01-01	271.469
2006-04-01	295.240
2006-07-01	313.937
2006-10-01	345.321
2007-01-01	354.187
2007-04-01	372.817
2007-07-01	399.370
2007-10-01	428.575
2008-01-01	448.488
2008-04-01	465.126
2008-07-01	433.267
2008-10-01	422.592
2009-01-01	403.072
2009-04-01	430.628
2009-07-01	460.646
2009-10-01	466.442
2010-01-01	448.404
2010-04-01	417.289
2010-07-01	439.149
2010-10-01	439.097
2011-01-01	458.287
2011-04-01	464.787
2011-07-01	449.159
2011-10-01	438.506
2012-01-01	460.199
2012-04-01	450.295
2012-07-01	464.325
2012-10-01	482.004
2013-01-01	487.663
2013-04-01	510.384
2013-07-01	523.830
2013-10-01	541.735
2014-01-01	549.232
2014-04-01	558.404
2014-07-01	533.990
2014-10-01	519.255
2015-01-01	517.957
2015-04-01	539.702