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	386
1981-10-01	354
1982-01-01	350
1982-04-01	344
1982-07-01	335
1982-10-01	359
1983-01-01	355
1983-04-01	358
1983-07-01	432
1983-10-01	505
1984-01-01	561
1984-04-01	656
1984-07-01	829
1984-10-01	1170
1985-01-01	1279
1985-04-01	1766
1985-07-01	2259
1985-10-01	2799
1986-01-01	3368
1986-04-01	3735
1986-07-01	3873
1986-10-01	3963
1987-01-01	4612
1987-04-01	4680
1987-07-01	4717
1987-10-01	5227
1988-01-01	4783
1988-04-01	4526
1988-07-01	4568
1988-10-01	4780
1989-01-01	4482
1989-04-01	4205
1989-07-01	4229
1989-10-01	4270
1990-01-01	4469
1990-04-01	4317
1990-07-01	4267
1990-10-01	4429
1991-01-01	4942
1991-04-01	6186
1991-07-01	6561
1991-10-01	7113
1992-01-01	7728
1992-04-01	8226
1992-07-01	9358
1992-10-01	9771
1993-01-01	10724
1993-04-01	11603
1993-07-01	12233
1993-10-01	14380
1994-01-01	15440
1994-04-01	17014
1994-07-01	18418
1994-10-01	18691
1995-01-01	21301
1995-04-01	24143
1995-07-01	25098
1995-10-01	26564
1996-01-01	28585
1996-04-01	31773
1996-07-01	37248
1996-10-01	41969
1997-01-01	43483
1997-04-01	46416
1997-07-01	49993
1997-10-01	49542
1998-01-01	48369
1998-04-01	51508
1998-07-01	50567
1998-10-01	50935
1999-01-01	49523
1999-04-01	47774
1999-07-01	47200
1999-10-01	47660
2000-01-01	49169
2000-04-01	48385
2000-07-01	47491
2000-10-01	47021
2001-01-01	44902
2001-04-01	44747
2001-07-01	43104
2001-10-01	44465
2002-01-01	42827
2002-04-01	45096
2002-07-01	46186
2002-10-01	47176
2003-01-01	48153
2003-04-01	50597
2003-07-01	53668
2003-10-01	53948
2004-01-01	58248
2004-04-01	61075
2004-07-01	62268
2004-10-01	65218
2005-01-01	67309
2005-04-01	68152
2005-07-01	70629
2005-10-01	74362
2006-01-01	76820
2006-04-01	81401
2006-07-01	85864
2006-10-01	89642
2007-01-01	90779
2007-04-01	100549
2007-07-01	102864
2007-10-01	105318
2008-01-01	109143
2008-04-01	112165
2008-07-01	108295
2008-10-01	102253
2009-01-01	104201
2009-04-01	116586
2009-07-01	123888
2009-10-01	121971
2010-01-01	122307
2010-04-01	122471
2010-07-01	128913
2010-10-01	130977
2011-01-01	137230
2011-04-01	141399
2011-07-01	144423
2011-10-01	148053
2012-01-01	154303
2012-04-01	154639
2012-07-01	163992
2012-10-01	159610
2013-01-01	161799
2013-04-01	155313
2013-07-01	167805
2013-10-01	176543
2014-01-01	179993
2014-04-01	179033
2014-07-01	174279
2014-10-01	178653
2015-01-01	175048
2015-04-01	179750
2015-07-01	177507
2015-10-01	172943
2016-01-01	174378
2016-04-01	171194
2016-07-01	172381
2016-10-01	168155
2017-01-01	171922
2017-04-01	174307
2017-07-01	177585
2017-10-01	181287
2018-01-01	187425
2018-04-01	189515