Quarter	Billions of US Dollars
1989-07-01	9.512
1989-10-01	8.180
1990-01-01	9.001
1990-04-01	8.906
1990-07-01	10.436
1990-10-01	13.315
1991-01-01	15.007
1991-04-01	16.715
1991-07-01	17.283
1991-10-01	18.668
1992-01-01	20.342
1992-04-01	21.868
1992-07-01	27.812
1992-10-01	28.855
1993-01-01	21.029
1993-04-01	20.040
1993-07-01	25.272
1993-10-01	25.702
1994-01-01	26.978
1994-04-01	25.209
1994-07-01	25.135
1994-10-01	26.792
1995-01-01	24.714
1995-04-01	26.507
1995-07-01	30.505
1995-10-01	33.897
1996-01-01	34.958
1996-04-01	44.353
1996-07-01	37.995
1996-10-01	42.896
1997-01-01	40.646
1997-04-01	44.333
1997-07-01	52.174
1997-10-01	52.059
1998-01-01	53.229
1998-04-01	54.102
1998-07-01	57.163
1998-10-01	56.010
1999-01-01	55.589
1999-04-01	57.668
1999-07-01	55.136
1999-10-01	50.782
2000-01-01	56.599
2000-04-01	61.006
2000-07-01	64.547
2000-10-01	71.443
2001-01-01	72.498
2001-04-01	62.659
2001-07-01	52.800
2001-10-01	48.944
2002-01-01	43.868
2002-04-01	49.660
2002-07-01	46.576
2002-10-01	48.885
2003-01-01	53.947
2003-04-01	52.446
2003-07-01	50.785
2003-10-01	48.967
2004-01-01	59.758
2004-04-01	63.219
2004-07-01	62.017
2004-10-01	58.616
2005-01-01	60.439
2005-04-01	64.244
2005-07-01	69.263
2005-10-01	67.897
2006-01-01	69.846
2006-04-01	73.293
2006-07-01	73.870
2006-10-01	86.766
2007-01-01	91.212
2007-04-01	113.433
2007-07-01	116.070
2007-10-01	115.543
2008-01-01	127.432
2008-04-01	133.331
2008-07-01	123.943
2008-10-01	92.674
2009-01-01	91.715
2009-04-01	82.793
2009-07-01	93.770
2009-10-01	95.046
2010-01-01	104.207
2010-04-01	89.724
2010-07-01	119.163
2010-10-01	91.670
2011-01-01	99.153
2011-04-01	96.528
2011-07-01	88.800
2011-10-01	84.796
2012-01-01	102.493
2012-04-01	107.666
2012-07-01	110.244
2012-10-01	111.919
2013-01-01	113.442
2013-04-01	117.476
2013-07-01	124.579
2013-10-01	134.620
2014-01-01	129.047
2014-04-01	135.650
2014-07-01	143.451
2014-10-01	144.240
2015-01-01	146.884
2015-04-01	144.101