Quarter	Billions of US Dollars
1989-07-01	3.6380
1989-10-01	5.1840
1990-01-01	6.4830
1990-04-01	5.4070
1990-07-01	6.4000
1990-10-01	5.9640
1991-01-01	6.5910
1991-04-01	5.1070
1991-07-01	5.2540
1991-10-01	6.1080
1992-01-01	4.4340
1992-04-01	5.0030
1992-07-01	5.7160
1992-10-01	4.2940
1993-01-01	4.3550
1993-04-01	4.5690
1993-07-01	3.3975
1993-10-01	3.7570
1994-01-01	3.1273
1994-04-01	3.2646
1994-07-01	3.9869
1994-10-01	2.8437
1995-01-01	2.5092
1995-04-01	3.6893
1995-07-01	3.6896
1995-10-01	4.2731
1996-01-01	4.5303
1996-04-01	4.1156
1996-07-01	5.4931
1996-10-01	4.5471
1997-01-01	5.1582
1997-04-01	5.0117
1997-07-01	5.1475
1997-10-01	4.4499
1998-01-01	5.8175
1998-04-01	4.2001
1998-07-01	5.2739
1998-10-01	6.2019
1999-01-01	5.8766
1999-04-01	5.3270
1999-07-01	7.3452
1999-10-01	8.0912
2000-01-01	9.4488
2000-04-01	8.9452
2000-07-01	8.7253
2000-10-01	8.6752
2001-01-01	9.3461
2001-04-01	6.8587
2001-07-01	7.3478
2001-10-01	8.3902
2002-01-01	9.9116
2002-04-01	9.5148
2002-07-01	11.4809
2002-10-01	11.3263
2003-01-01	11.2012
2003-04-01	11.2267
2003-07-01	8.1066
2003-10-01	10.3687
2004-01-01	11.9197
2004-04-01	12.1141
2004-07-01	16.2714
2004-10-01	18.6808
2005-01-01	19.7813
2005-04-01	14.8670
2005-07-01	15.2051
2005-10-01	15.7355
2006-01-01	20.5246
2006-04-01	25.5464
2006-07-01	27.2313
2006-10-01	28.5985
2007-01-01	26.9130
2007-04-01	28.3426
2007-07-01	29.0108
2007-10-01	25.0006
2008-01-01	23.9778
2008-04-01	30.0983
2008-07-01	25.1231
2008-10-01	20.9898
2009-01-01	18.2385
2009-04-01	19.6681
2009-07-01	21.8556
2009-10-01	17.3406
2010-01-01	18.8471
2010-04-01	16.3751
2010-07-01	18.4464
2010-10-01	15.2621
2011-01-01	18.1204
2011-04-01	20.1095
2011-07-01	22.3639
2011-10-01	19.0800
2012-01-01	21.4022
2012-04-01	22.6281
2012-07-01	25.2518
2012-10-01	22.8986
2013-01-01	20.6759
2013-04-01	18.5055
2013-07-01	21.8810
2013-10-01	19.0192
2014-01-01	24.8724
2014-04-01	24.1812
2014-07-01	26.2661
2014-10-01	20.5365
2015-01-01	17.1411
2015-04-01	18.8496