Quarter	Billions of US Dollars
1968-07-01	0.040
1971-01-01	0.086
1971-04-01	0.051
1971-07-01	0.025
1971-10-01	0.081
1972-01-01	0.203
1972-04-01	0.168
1972-07-01	0.209
1972-10-01	0.370
1973-01-01	0.191
1973-04-01	0.362
1973-07-01	0.147
1973-10-01	0.515
1974-01-01	0.180
1974-04-01	0.528
1974-07-01	0.032
1974-10-01	0.166
1975-01-01	0.337
1975-04-01	0.572
1975-07-01	0.187
1975-10-01	0.190
1976-01-01	0.187
1976-04-01	0.459
1976-07-01	0.657
1976-10-01	0.563
1977-01-01	0.654
1977-04-01	0.864
1977-07-01	1.285
1977-10-01	1.488
1978-01-01	1.744
1978-04-01	1.356
1978-07-01	0.942
1978-10-01	1.284
1979-01-01	1.105
1979-04-01	0.796
1979-07-01	0.842
1979-10-01	0.329
1980-01-01	0.193
1980-04-01	0.839
1980-07-01	0.605
1980-10-01	0.446
1981-01-01	0.415
1981-04-01	1.027
1981-07-01	0.752
1981-10-01	0.974
1982-01-01	1.315
1982-04-01	0.773
1982-07-01	0.370
1982-10-01	0.620
1983-01-01	0.316
1983-04-01	0.611
1983-07-01	1.423
1983-10-01	0.408
1984-01-01	0.792
1984-04-01	0.652
1984-07-01	0.680
1984-10-01	1.649
1985-01-01	2.087
1985-04-01	1.964
1985-07-01	1.888
1985-10-01	1.748
1986-01-01	2.097
1986-04-01	1.013
1986-07-01	0.490
1986-10-01	0.397
1987-01-01	1.105
1987-04-01	0.519
1987-07-01	1.063
1987-10-01	0.503
1988-01-01	1.801
1988-04-01	1.231
1988-07-01	1.784
1988-10-01	1.619
1989-01-01	2.009
1989-04-01	0.736
1989-07-01	2.975
1989-10-01	1.168
1990-01-01	37.109
1990-04-01	2.811
1990-07-01	2.109
1990-10-01	17.932
1991-01-01	4.714
1991-04-01	3.545
1991-07-01	3.662
1991-10-01	3.343
1992-01-01	6.743
1992-04-01	21.639
1992-07-01	4.297
1992-10-01	9.038
1993-01-01	7.651
1993-04-01	8.821
1993-07-01	9.729
1993-10-01	27.188
1994-01-01	13.978
1994-04-01	50.549
1994-07-01	15.124
1994-10-01	15.018
1995-01-01	9.637
1995-04-01	10.515
1995-07-01	15.631
1995-10-01	12.015
1996-01-01	19.190
1996-04-01	33.116
1996-07-01	35.168
1996-10-01	27.747
1997-01-01	31.949
1997-04-01	42.345
1997-07-01	38.724
1997-10-01	14.866
1998-01-01	23.016
1998-04-01	28.716
1998-07-01	15.986
1998-10-01	13.300
1999-01-01	17.970
1999-04-01	24.799
1999-07-01	13.235
1999-10-01	24.092
2000-01-01	56.771
2000-04-01	17.088
2000-07-01	28.069
2000-10-01	7.181
2001-01-01	25.930
2001-04-01	52.984
2001-07-01	13.100
2001-10-01	21.863
2002-01-01	26.475
2002-04-01	26.941
2002-07-01	15.905
2002-10-01	30.055
2003-01-01	31.893
2003-04-01	39.718
2003-07-01	32.777
2003-10-01	31.979
2004-01-01	44.294
2004-04-01	36.068
2004-07-01	34.054
2004-10-01	34.132
2005-01-01	64.789
2005-04-01	45.861
2005-07-01	47.967
2005-10-01	49.471
2006-01-01	53.886
2006-04-01	31.413
2006-07-01	42.150
2006-10-01	78.195
2007-01-01	79.129
2007-04-01	80.653
2007-07-01	36.025
2007-10-01	45.891
2008-01-01	25.547
2008-04-01	69.314
2008-07-01	29.513
2008-10-01	8.390
2009-01-01	33.018
2009-04-01	61.859
2009-07-01	69.702
2009-10-01	85.967
2010-01-01	72.167
2010-04-01	66.099
2010-07-01	106.368
2010-10-01	91.335
2011-01-01	101.813
2011-04-01	108.591
2011-07-01	51.597
2011-10-01	80.293
2012-01-01	144.274
2012-04-01	93.483
2012-07-01	123.686
2012-10-01	141.822
2013-01-01	128.083
2013-04-01	135.059
2013-07-01	112.400
2013-10-01	129.355
2014-01-01	120.816
2014-04-01	185.340
2014-07-01	122.422
2014-10-01	134.912
2015-01-01	124.020
2015-04-01	137.011