Quarter	Billions of US Dollars
1987-01-01	0.106
1987-04-01	0.105
1987-07-01	0.104
1987-10-01	0.116
1988-01-01	0.112
1988-04-01	0.105
1988-07-01	0.103
1988-10-01	0.107
1989-01-01	0.102
1989-04-01	0.100
1989-07-01	0.134
1989-10-01	0.143
1990-01-01	0.144
1990-04-01	0.147
1990-07-01	0.156
1990-10-01	0.160
1991-01-01	0.144
1991-04-01	0.138
1991-07-01	0.722
1991-10-01	0.732
1992-01-01	0.722
1992-04-01	0.731
1992-07-01	0.742
1992-10-01	0.758
1993-01-01	1.056
1993-04-01	1.053
1993-07-01	1.096
1993-10-01	1.062
1994-01-01	1.338
1994-04-01	1.401
1994-07-01	1.445
1994-10-01	1.436
1995-01-01	1.500
1995-04-01	1.608
1995-07-01	2.348
1995-10-01	2.557
1996-01-01	2.785
1996-04-01	3.240
1996-07-01	3.510
1996-10-01	3.614
1997-01-01	4.506
1997-04-01	4.716
1997-07-01	5.284
1997-10-01	5.243
1998-01-01	5.589
1998-04-01	7.641
1998-07-01	7.062
1998-10-01	7.591
1999-01-01	7.937
1999-04-01	7.806
1999-07-01	7.931
1999-10-01	8.367
2000-01-01	7.424
2000-04-01	7.303
2000-07-01	7.595
2000-10-01	7.051
2001-01-01	8.456
2001-04-01	8.413
2001-07-01	8.806
2001-10-01	9.806
2002-01-01	9.393
2002-04-01	9.896
2002-07-01	9.335
2002-10-01	9.459
2003-01-01	10.883
2003-04-01	13.116
2003-07-01	15.006
2003-10-01	20.755
2004-01-01	21.352
2004-04-01	21.322
2004-07-01	21.681
2004-10-01	22.392
2005-01-01	22.360
2005-04-01	21.013
2005-07-01	21.389
2005-10-01	21.556
2006-01-01	21.683
2006-04-01	21.769
2006-07-01	21.657
2006-10-01	23.118
2007-01-01	23.955
2007-04-01	25.543
2007-07-01	25.236
2007-10-01	28.349
2008-01-01	26.050
2008-04-01	27.022
2008-07-01	26.372
2008-10-01	26.346
2009-01-01	25.561
2009-04-01	24.732
2009-07-01	24.986
2009-10-01	24.865
2010-01-01	24.771
2010-04-01	23.367
2010-07-01	28.513
2010-10-01	29.355
2011-01-01	31.432
2011-04-01	34.948
2011-07-01	35.297
2011-10-01	34.136
2012-01-01	33.848
2012-04-01	42.689
2012-07-01	45.726
2012-10-01	48.361
2013-01-01	48.280
2013-04-01	57.769
2013-07-01	57.149
2013-10-01	65.401
2014-01-01	67.254
2014-04-01	79.375
2014-07-01	85.938
2014-10-01	95.134
2015-01-01	104.178
2015-04-01	127.737