Quarter	Billions of US Dollars
1990-04-01	150
1990-07-01	150
1990-10-01	150
1991-01-01	150
1991-04-01	150
1991-07-01	150
1991-10-01	150
1992-01-01	150
1992-04-01	150
1992-07-01	150
1992-10-01	150
1993-01-01	150
1993-04-01	150
1993-07-01	400
1993-10-01	367
1994-01-01	445
1994-04-01	452
1994-07-01	468
1994-10-01	468
1995-01-01	441
1995-04-01	468
1995-07-01	494
1995-10-01	458
1996-01-01	445
1996-04-01	423
1996-07-01	434
1996-10-01	531
1997-01-01	534
1997-04-01	862
1997-07-01	824
1997-10-01	773
1998-01-01	860
1998-04-01	866
1998-07-01	1280
1998-10-01	1223
1999-01-01	1187
1999-04-01	1424
1999-07-01	1487
1999-10-01	1452
2000-01-01	1393
2000-04-01	1370
2000-07-01	1327
2000-10-01	1304
2001-01-01	1333
2001-04-01	1546
2001-07-01	1663
2001-10-01	1762
2002-01-01	2244
2002-04-01	2027
2002-07-01	2076
2002-10-01	2025
2003-01-01	2065
2003-04-01	2161
2003-07-01	2322
2003-10-01	3251
2004-01-01	3187
2004-04-01	3416
2004-07-01	4265
2004-10-01	4905
2005-01-01	4572
2005-04-01	4456
2005-07-01	4702
2005-10-01	4617
2006-01-01	4747
2006-04-01	5631
2006-07-01	5690
2006-10-01	5290
2007-01-01	5910
2007-04-01	8197
2007-07-01	8172
2007-10-01	7932
2008-01-01	8399
2008-04-01	8344
2008-07-01	8273
2008-10-01	8848
2009-01-01	8206
2009-04-01	13407
2009-07-01	14469
2009-10-01	14658
2010-01-01	15202
2010-04-01	13283
2010-07-01	15843
2010-10-01	15304
2011-01-01	15245
2011-04-01	17422
2011-07-01	19056
2011-10-01	18452
2012-01-01	11296
2012-04-01	10207
2012-07-01	4609
2012-10-01	10030
2013-01-01	9787
2013-04-01	10112
2013-07-01	10229
2013-10-01	6494
2014-01-01	10789
2014-04-01	11981
2014-07-01	9302
2014-10-01	8958
2015-01-01	8051
2015-04-01	9440
2015-07-01	9501
2015-10-01	8837
2016-01-01	9180
2016-04-01	8086
2016-07-01	9569
2016-10-01	9099
2017-01-01	9199
2017-04-01	10223
2017-07-01	11050
2017-10-01	11204
2018-01-01	13210
2018-04-01	11366