Quarter	Billions of US Dollars
1989-07-01	1.2690
1989-10-01	1.7330
1990-01-01	1.5540
1990-04-01	1.4070
1990-07-01	1.8000
1990-10-01	2.0480
1991-01-01	1.7640
1991-04-01	1.6380
1991-07-01	1.5580
1991-10-01	1.9260
1992-01-01	1.6520
1992-04-01	1.7100
1992-07-01	2.4600
1992-10-01	2.2930
1993-01-01	1.9720
1993-04-01	2.0470
1993-07-01	3.1068
1993-10-01	2.8041
1994-01-01	2.9345
1994-04-01	2.5987
1994-07-01	2.9180
1994-10-01	2.3133
1995-01-01	2.5168
1995-04-01	3.2447
1995-07-01	3.2564
1995-10-01	2.8886
1996-01-01	3.9806
1996-04-01	3.5811
1996-07-01	5.0887
1996-10-01	5.9643
1997-01-01	6.5835
1997-04-01	8.1614
1997-07-01	7.3640
1997-10-01	5.5892
1998-01-01	4.9983
1998-04-01	3.9757
1998-07-01	5.4941
1998-10-01	5.5886
1999-01-01	4.4974
1999-04-01	4.1081
1999-07-01	3.8789
1999-10-01	5.2576
2000-01-01	6.4542
2000-04-01	7.3307
2000-07-01	7.9501
2000-10-01	9.0377
2001-01-01	9.2698
2001-04-01	5.7908
2001-07-01	4.4269
2001-10-01	3.6674
2002-01-01	3.5472
2002-04-01	5.1725
2002-07-01	5.6887
2002-10-01	6.0607
2003-01-01	6.2194
2003-04-01	5.7624
2003-07-01	6.3610
2003-10-01	7.1723
2004-01-01	9.6951
2004-04-01	7.7952
2004-07-01	8.3855
2004-10-01	7.4948
2005-01-01	9.1615
2005-04-01	9.5060
2005-07-01	11.5092
2005-10-01	11.6634
2006-01-01	14.5457
2006-04-01	19.0259
2006-07-01	18.8934
2006-10-01	19.4014
2007-01-01	24.5886
2007-04-01	26.2611
2007-07-01	26.6178
2007-10-01	31.5101
2008-01-01	30.3095
2008-04-01	29.8241
2008-07-01	37.3178
2008-10-01	19.0106
2009-01-01	16.6261
2009-04-01	17.2715
2009-07-01	16.1013
2009-10-01	13.8085
2010-01-01	15.3188
2010-04-01	14.6109
2010-07-01	15.8263
2010-10-01	16.7994
2011-01-01	16.6063
2011-04-01	20.4164
2011-07-01	17.0477
2011-10-01	14.5690
2012-01-01	16.0424
2012-04-01	18.2963
2012-07-01	17.6863
2012-10-01	17.2857
2013-01-01	17.6362
2013-04-01	21.6078
2013-07-01	23.6148
2013-10-01	26.5241
2014-01-01	32.1534
2014-04-01	34.3259
2014-07-01	34.4753
2014-10-01	32.3438
2015-01-01	28.5823
2015-04-01	27.6532