Quarter	Billions of US Dollars
1971-10-01	0.015
1972-01-01	0.015
1972-04-01	0.015
1972-07-01	0.015
1972-10-01	0.015
1973-01-01	0.015
1973-04-01	0.015
1973-07-01	0.091
1973-10-01	0.090
1974-01-01	0.142
1974-04-01	0.142
1974-07-01	0.142
1974-10-01	0.146
1975-01-01	0.171
1975-04-01	0.171
1975-07-01	0.168
1975-10-01	0.169
1976-01-01	0.171
1976-04-01	0.172
1976-07-01	0.172
1976-10-01	0.173
1977-01-01	0.172
1977-04-01	0.280
1977-07-01	0.305
1977-10-01	0.311
1978-01-01	0.313
1978-04-01	0.313
1978-07-01	0.267
1978-10-01	0.265
1979-01-01	0.259
1979-04-01	0.256
1979-07-01	0.259
1979-10-01	0.261
1980-01-01	0.257
1980-04-01	0.261
1980-07-01	0.259
1980-10-01	0.255
1981-01-01	0.251
1981-04-01	0.244
1981-07-01	0.232
1981-10-01	0.297
1982-01-01	0.293
1982-04-01	0.292
1982-07-01	0.308
1982-10-01	0.345
1983-01-01	0.341
1983-04-01	0.334
1983-07-01	0.322
1983-10-01	0.376
1984-01-01	0.376
1984-04-01	0.376
1984-07-01	0.362
1984-10-01	0.437
1985-01-01	0.479
1985-04-01	0.416
1985-07-01	0.377
1985-10-01	0.410
1986-01-01	0.417
1986-04-01	0.389
1986-07-01	0.496
1986-10-01	0.531
1987-01-01	0.552
1987-04-01	0.763
1987-07-01	0.762
1987-10-01	0.815
1988-01-01	0.956
1988-04-01	0.925
1988-07-01	0.887
1988-10-01	0.919
1989-01-01	0.890
1989-04-01	0.999
1989-07-01	1.022
1989-10-01	0.992
1990-01-01	0.983
1990-04-01	1.123
1990-07-01	1.161
1990-10-01	1.176
1991-01-01	1.062
1991-04-01	1.329
1991-07-01	1.514
1991-10-01	1.467
1992-01-01	1.434
1992-04-01	1.583
1992-07-01	1.623
1992-10-01	1.566
1993-01-01	1.585
1993-04-01	2.007
1993-07-01	2.966
1993-10-01	5.637
1994-01-01	7.623
1994-04-01	8.428
1994-07-01	9.412
1994-10-01	11.554
1995-01-01	11.764
1995-04-01	11.647
1995-07-01	11.419
1995-10-01	12.234
1996-01-01	14.139
1996-04-01	13.120
1996-07-01	14.022
1996-10-01	14.549
1997-01-01	15.940
1997-04-01	18.008
1997-07-01	21.639
1997-10-01	21.473
1998-01-01	21.597
1998-04-01	21.552
1998-07-01	20.879
1998-10-01	20.236
1999-01-01	23.088
1999-04-01	23.472
1999-07-01	24.481
1999-10-01	24.072
2000-01-01	24.906
2000-04-01	24.272
2000-07-01	28.650
2000-10-01	28.808
2001-01-01	32.140
2001-04-01	35.696
2001-07-01	35.675
2001-10-01	36.777
2002-01-01	38.179
2002-04-01	39.077
2002-07-01	38.940
2002-10-01	38.909
2003-01-01	40.918
2003-04-01	42.673
2003-07-01	42.432
2003-10-01	47.423
2004-01-01	46.761
2004-04-01	46.282
2004-07-01	47.934
2004-10-01	49.881
2005-01-01	51.182
2005-04-01	53.154
2005-07-01	55.244
2005-10-01	55.661
2006-01-01	55.546
2006-04-01	56.960
2006-07-01	57.869
2006-10-01	61.462
2007-01-01	62.224
2007-04-01	65.855
2007-07-01	65.201
2007-10-01	65.791
2008-01-01	66.106
2008-04-01	68.200
2008-07-01	68.857
2008-10-01	66.746
2009-01-01	65.080
2009-04-01	68.449
2009-07-01	74.367
2009-10-01	77.695
2010-01-01	77.739
2010-04-01	76.998
2010-07-01	82.189
2010-10-01	84.554
2011-01-01	81.852
2011-04-01	84.610
2011-07-01	83.339
2011-10-01	83.794
2012-01-01	95.987
2012-04-01	103.432
2012-07-01	106.955
2012-10-01	111.069
2013-01-01	111.746
2013-04-01	116.373
2013-07-01	114.842
2013-10-01	115.515
2014-01-01	118.862
2014-04-01	119.819
2014-07-01	120.756
2014-10-01	125.058
2015-01-01	124.547
2015-04-01	126.404