Quarter	Millions of US Dollars
1972-01-01	40
1972-04-01	80
1972-07-01	111
1972-10-01	216
1973-01-01	289
1973-04-01	301
1973-07-01	339
1973-10-01	394
1974-01-01	400
1974-04-01	397
1974-07-01	391
1974-10-01	423
1975-01-01	502
1975-04-01	560
1975-07-01	544
1975-10-01	545
1976-01-01	600
1976-04-01	721
1976-07-01	775
1976-10-01	888
1977-01-01	1008
1977-04-01	1409
1977-07-01	1559
1977-10-01	2059
1978-01-01	2837
1978-04-01	3207
1978-07-01	3546
1978-10-01	4010
1979-01-01	4217
1979-04-01	4342
1979-07-01	4553
1979-10-01	4673
1980-01-01	4321
1980-04-01	4910
1980-07-01	5105
1980-10-01	5117
1981-01-01	4965
1981-04-01	4782
1981-07-01	4876
1981-10-01	5244
1982-01-01	5090
1982-04-01	4636
1982-07-01	4694
1982-10-01	4973
1983-01-01	4515
1983-04-01	4388
1983-07-01	4424
1983-10-01	4328
1984-01-01	4337
1984-04-01	4087
1984-07-01	3803
1984-10-01	3673
1985-01-01	3596
1985-04-01	3611
1985-07-01	3954
1985-10-01	3644
1986-01-01	3843
1986-04-01	3870
1986-07-01	4042
1986-10-01	3741
1987-01-01	3738
1987-04-01	3691
1987-07-01	3586
1987-10-01	3888
1988-01-01	3895
1988-04-01	3351
1988-07-01	3057
1988-10-01	3450
1989-01-01	3320
1989-04-01	3153
1989-07-01	4151
1989-10-01	3698
1990-01-01	38006
1990-04-01	37805
1990-07-01	38016
1990-10-01	53794
1991-01-01	53476
1991-04-01	53391
1991-07-01	54064
1991-10-01	55308
1992-01-01	54773
1992-04-01	55287
1992-07-01	55828
1992-10-01	55135
1993-01-01	55164
1993-04-01	72713
1993-07-01	73481
1993-10-01	83483
1994-01-01	84547
1994-04-01	127457
1994-07-01	129280
1994-10-01	130348
1995-01-01	136293
1995-04-01	139494
1995-07-01	143340
1995-10-01	146682
1996-01-01	152206
1996-04-01	155479
1996-07-01	164065
1996-10-01	168788
1997-01-01	179700
1997-04-01	187265
1997-07-01	189649
1997-10-01	189879
1998-01-01	193612
1998-04-01	200146
1998-07-01	205238
1998-10-01	185629
1999-01-01	185789
1999-04-01	193902
1999-07-01	199532
1999-10-01	205684
2000-01-01	215006
2000-04-01	214309
2000-07-01	226298
2000-10-01	227468
2001-01-01	233854
2001-04-01	227907
2001-07-01	231747
2001-10-01	224976
2002-01-01	227649
2002-04-01	232124
2002-07-01	231518
2002-10-01	235524
2003-01-01	232113
2003-04-01	232709
2003-07-01	232879
2003-10-01	239687
2004-01-01	242961
2004-04-01	240513
2004-07-01	243244
2004-10-01	254283
2005-01-01	256121
2005-04-01	224209
2005-07-01	224598
2005-10-01	226678
2006-01-01	227858
2006-04-01	213395
2006-07-01	215968
2006-10-01	220326
2007-01-01	220148
2007-04-01	223160
2007-07-01	224374
2007-10-01	226184
2008-01-01	223946
2008-04-01	226179
2008-07-01	218273
2008-10-01	209973
2009-01-01	209125
2009-04-01	207988
2009-07-01	214152
2009-10-01	222545
2010-01-01	215269
2010-04-01	216484
2010-07-01	226585
2010-10-01	230885
2011-01-01	232130
2011-04-01	232565
2011-07-01	234742
2011-10-01	239490
2012-01-01	243202
2012-04-01	243244
2012-07-01	246002
2012-10-01	250108
2013-01-01	248747
2013-04-01	250570
2013-07-01	255326
2013-10-01	265470
2014-01-01	269414
2014-04-01	278408
2014-07-01	278565
2014-10-01	277599
2015-01-01	283133
2015-04-01	287278
2015-07-01	284491
2015-10-01	283243
2016-01-01	297307
2016-04-01	317578
2016-07-01	326367
2016-10-01	331009
2017-01-01	350734
2017-04-01	370175
2017-07-01	376955
2017-10-01	383598
2018-01-01	405113
2018-04-01	400701