Quarter	Billions of US Dollars
1987-01-01	1.6490
1987-04-01	1.2090
1987-07-01	1.4840
1987-10-01	1.5170
1988-01-01	2.4370
1988-04-01	2.3120
1988-07-01	2.2810
1988-10-01	2.1670
1989-01-01	2.0880
1989-04-01	2.6250
1989-07-01	2.7560
1989-10-01	3.0570
1990-01-01	3.3230
1990-04-01	3.9200
1990-07-01	3.8250
1990-10-01	3.5790
1991-01-01	3.4660
1991-04-01	3.4660
1991-07-01	3.1710
1991-10-01	3.5690
1992-01-01	4.7740
1992-04-01	5.2080
1992-07-01	4.6590
1992-10-01	3.4780
1993-01-01	3.7970
1993-04-01	3.8180
1993-07-01	1.3301
1993-10-01	1.4799
1994-01-01	2.1033
1994-04-01	2.3466
1994-07-01	3.0616
1994-10-01	3.2020
1995-01-01	1.9332
1995-04-01	1.6671
1995-07-01	2.0651
1995-10-01	2.1472
1996-01-01	2.3749
1996-04-01	2.5203
1996-07-01	2.7730
1996-10-01	3.1813
1997-01-01	3.5462
1997-04-01	4.1631
1997-07-01	3.2535
1997-10-01	2.4834
1998-01-01	2.3913
1998-04-01	3.2025
1998-07-01	3.9213
1998-10-01	4.1308
1999-01-01	5.3509
1999-04-01	4.3722
1999-07-01	4.4720
1999-10-01	4.9920
2000-01-01	3.6113
2000-04-01	3.5266
2000-07-01	3.8792
2000-10-01	2.6667
2001-01-01	2.6837
2001-04-01	3.2913
2001-07-01	2.6926
2001-10-01	2.8712
2002-01-01	3.3414
2002-04-01	3.8063
2002-07-01	4.1330
2002-10-01	5.6764
2003-01-01	6.0189
2003-04-01	5.9660
2003-07-01	5.8881
2003-10-01	6.7924
2004-01-01	6.7060
2004-04-01	7.2714
2004-07-01	9.0593
2004-10-01	11.8694
2005-01-01	14.0523
2005-04-01	15.3139
2005-07-01	14.8218
2005-10-01	14.9721
2006-01-01	17.0436
2006-04-01	18.3502
2006-07-01	18.1092
2006-10-01	19.8992
2007-01-01	28.0243
2007-04-01	29.4836
2007-07-01	26.8297
2007-10-01	27.5665
2008-01-01	22.1167
2008-04-01	25.6703
2008-07-01	24.1929
2008-10-01	21.5368
2009-01-01	9.9356
2009-04-01	9.5104
2009-07-01	12.1513
2009-10-01	13.3539
2010-01-01	14.8884
2010-04-01	12.9353
2010-07-01	13.6798
2010-10-01	13.1353
2011-01-01	14.0099
2011-04-01	15.8398
2011-07-01	19.3503
2011-10-01	19.6749
2012-01-01	20.4692
2012-04-01	19.6087
2012-07-01	19.9138
2012-10-01	26.4078
2013-01-01	28.7988
2013-04-01	30.7387
2013-07-01	34.9097
2013-10-01	38.9747
2014-01-01	39.0717
2014-04-01	39.8583
2014-07-01	39.0801
2014-10-01	36.9360
2015-01-01	32.3909
2015-04-01	31.1257