Quarter	Billions of US Dollars
1968-04-01	0.030
1969-01-01	0.060
1970-10-01	0.015
1971-01-01	0.107
1971-04-01	0.020
1971-07-01	0.020
1971-10-01	0.120
1972-01-01	0.116
1972-04-01	0.261
1972-07-01	0.274
1972-10-01	0.186
1973-01-01	0.440
1973-04-01	0.367
1973-07-01	0.282
1973-10-01	0.235
1974-01-01	0.095
1974-04-01	0.040
1974-07-01	0.085
1974-10-01	0.095
1975-01-01	0.025
1975-04-01	0.100
1975-07-01	0.155
1975-10-01	0.107
1976-01-01	0.348
1976-04-01	0.366
1976-07-01	0.131
1976-10-01	0.285
1977-01-01	0.275
1977-04-01	0.311
1977-07-01	0.399
1977-10-01	0.253
1978-01-01	0.278
1978-04-01	0.442
1978-07-01	0.280
1978-10-01	-0.029
1979-01-01	0.153
1979-04-01	0.212
1979-07-01	0.005
1979-10-01	0.380
1980-01-01	0.107
1980-04-01	0.490
1980-07-01	0.387
1980-10-01	0.188
1981-01-01	0.050
1981-04-01	0.116
1981-07-01	0.306
1981-10-01	0.590
1982-01-01	0.032
1982-04-01	0.295
1982-07-01	0.403
1982-10-01	0.948
1983-01-01	0.646
1983-04-01	0.252
1983-07-01	0.045
1983-10-01	0.894
1984-01-01	1.354
1984-04-01	0.306
1984-07-01	0.599
1984-10-01	1.512
1985-01-01	0.463
1985-04-01	0.413
1985-07-01	1.094
1985-10-01	3.302
1986-01-01	0.668
1986-04-01	1.009
1986-07-01	1.549
1986-10-01	0.278
1987-01-01	0.608
1987-04-01	1.897
1987-07-01	0.218
1987-10-01	0.698
1988-01-01	2.019
1988-04-01	2.477
1988-07-01	3.407
1988-10-01	-0.787
1989-01-01	2.829
1989-04-01	0.827
1989-07-01	4.175
1989-10-01	3.668
1990-01-01	3.035
1990-04-01	1.733
1990-07-01	4.746
1990-10-01	3.970
1991-01-01	8.205
1991-04-01	6.423
1991-07-01	6.072
1991-10-01	3.681
1992-01-01	5.242
1992-04-01	2.884
1992-07-01	0.342
1992-10-01	9.341
1993-01-01	0.920
1993-04-01	5.942
1993-07-01	4.353
1993-10-01	5.297
1994-01-01	6.338
1994-04-01	3.045
1994-07-01	4.022
1994-10-01	1.988
1995-01-01	1.611
1995-04-01	3.988
1995-07-01	1.110
1995-10-01	3.712
1996-01-01	2.739
1996-04-01	4.368
1996-07-01	5.179
1996-10-01	20.785
1997-01-01	9.235
1997-04-01	9.267
1997-07-01	6.326
1997-10-01	11.597
1998-01-01	19.614
1998-04-01	12.191
1998-07-01	5.621
1998-10-01	6.849
1999-01-01	24.856
1999-04-01	31.858
1999-07-01	27.297
1999-10-01	27.666
2000-01-01	29.210
2000-04-01	25.993
2000-07-01	17.524
2000-10-01	24.018
2001-01-01	18.316
2001-04-01	25.575
2001-07-01	21.950
2001-10-01	13.272
2002-01-01	14.318
2002-04-01	33.622
2002-07-01	16.052
2002-10-01	28.404
2003-01-01	37.488
2003-04-01	46.440
2003-07-01	41.121
2003-10-01	56.291
2004-01-01	52.141
2004-04-01	45.412
2004-07-01	35.992
2004-10-01	57.468
2005-01-01	65.053
2005-04-01	55.142
2005-07-01	37.073
2005-10-01	87.876
2006-01-01	62.238
2006-04-01	68.826
2006-07-01	74.494
2006-10-01	120.317
2007-01-01	85.073
2007-04-01	113.966
2007-07-01	64.288
2007-10-01	45.989
2008-01-01	6.358
2008-04-01	167.352
2008-07-01	130.991
2008-10-01	276.977
2009-01-01	105.106
2009-04-01	64.394
2009-07-01	88.519
2009-10-01	43.260
2010-01-01	18.249
2010-04-01	-7.600
2010-07-01	40.851
2010-10-01	-11.421
2011-01-01	-4.139
2011-04-01	25.473
2011-07-01	-19.095
2011-10-01	-18.665
2012-01-01	12.249
2012-04-01	-55.367
2012-07-01	-15.618
2012-10-01	12.113
2013-01-01	-8.044
2013-04-01	-26.169
2013-07-01	-4.830
2013-10-01	2.965
2014-01-01	-32.813
2014-04-01	4.582
2014-07-01	18.545
2014-10-01	-24.957
2015-01-01	-11.961
2015-04-01	25.467