Quarter	Millions of US Dollars
1974-10-01	19
1975-01-01	19
1975-04-01	19
1975-07-01	19
1975-10-01	19
1976-01-01	19
1976-04-01	29
1976-07-01	53
1976-10-01	93
1977-01-01	119
1977-04-01	119
1977-07-01	119
1977-10-01	167
1978-01-01	215
1978-04-01	232
1978-07-01	240
1978-10-01	243
1979-01-01	280
1979-04-01	279
1979-07-01	256
1979-10-01	254
1980-01-01	246
1980-04-01	259
1980-07-01	259
1980-10-01	306
1981-01-01	298
1981-04-01	284
1981-07-01	356
1981-10-01	324
1982-01-01	320
1982-04-01	314
1982-07-01	305
1982-10-01	329
1983-01-01	325
1983-04-01	328
1983-07-01	402
1983-10-01	475
1984-01-01	531
1984-04-01	626
1984-07-01	799
1984-10-01	1140
1985-01-01	1249
1985-04-01	1686
1985-07-01	2179
1985-10-01	2724
1986-01-01	3243
1986-04-01	3610
1986-07-01	3748
1986-10-01	3838
1987-01-01	4537
1987-04-01	4605
1987-07-01	4642
1987-10-01	5152
1988-01-01	4708
1988-04-01	4501
1988-07-01	4573
1988-10-01	4785
1989-01-01	4487
1989-04-01	4210
1989-07-01	4234
1989-10-01	4315
1990-01-01	4514
1990-04-01	4362
1990-07-01	4312
1990-10-01	4474
1991-01-01	4987
1991-04-01	6231
1991-07-01	6626
1991-10-01	7178
1992-01-01	7768
1992-04-01	8266
1992-07-01	9530
1992-10-01	10030
1993-01-01	11060
1993-04-01	12000
1993-07-01	12827
1993-10-01	15005
1994-01-01	16191
1994-04-01	17966
1994-07-01	19355
1994-10-01	19538
1995-01-01	22113
1995-04-01	25023
1995-07-01	25858
1995-10-01	26928
1996-01-01	28877
1996-04-01	32350
1996-07-01	37683
1996-10-01	42481
1997-01-01	44603
1997-04-01	47591
1997-07-01	51261
1997-10-01	50617
1998-01-01	49399
1998-04-01	52984
1998-07-01	52127
1998-10-01	52901
1999-01-01	51284
1999-04-01	49642
1999-07-01	49200
1999-10-01	49706
2000-01-01	51048
2000-04-01	50717
2000-07-01	50394
2000-10-01	49473
2001-01-01	47431
2001-04-01	46858
2001-07-01	46095
2001-10-01	46702
2002-01-01	44829
2002-04-01	47187
2002-07-01	49651
2002-10-01	52563
2003-01-01	53057
2003-04-01	55491
2003-07-01	59810
2003-10-01	61119
2004-01-01	65027
2004-04-01	67460
2004-07-01	68948
2004-10-01	70873
2005-01-01	73115
2005-04-01	74160
2005-07-01	75358
2005-10-01	80333
2006-01-01	82838
2006-04-01	87988
2006-07-01	92580
2006-10-01	96389
2007-01-01	97673
2007-04-01	106134
2007-07-01	107808
2007-10-01	110541
2008-01-01	115038
2008-04-01	117940
2008-07-01	113504
2008-10-01	105901
2009-01-01	107166
2009-04-01	119983
2009-07-01	127788
2009-10-01	125018
2010-01-01	125018
2010-04-01	124976
2010-07-01	131237
2010-10-01	134031
2011-01-01	140338
2011-04-01	144340
2011-07-01	147488
2011-10-01	151908
2012-01-01	158213
2012-04-01	159749
2012-07-01	169398
2012-10-01	164773
2013-01-01	167095
2013-04-01	160807
2013-07-01	173605
2013-10-01	182057
2014-01-01	186105
2014-04-01	185331
2014-07-01	181194
2014-10-01	186296
2015-01-01	181603
2015-04-01	185292
2015-07-01	181064
2015-10-01	176070
2016-01-01	178328
2016-04-01	177276
2016-07-01	178511
2016-10-01	173850
2017-01-01	179016
2017-04-01	178117
2017-07-01	182459
2017-10-01	186105
2018-01-01	189827
2018-04-01	194199