Quarter	Millions of US Dollars
1971-01-01	43
1971-04-01	72
1971-07-01	105
1971-10-01	107
1972-01-01	110
1972-04-01	142
1972-07-01	140
1972-10-01	140
1973-01-01	156
1973-04-01	196
1973-07-01	197
1973-10-01	188
1974-01-01	231
1974-04-01	310
1974-07-01	305
1974-10-01	485
1975-01-01	907
1975-04-01	1313
1975-07-01	1443
1975-10-01	1905
1976-01-01	2706
1976-04-01	3443
1976-07-01	3701
1976-10-01	4136
1977-01-01	4645
1977-04-01	5270
1977-07-01	5620
1977-10-01	6393
1978-01-01	7058
1978-04-01	7705
1978-07-01	9168
1978-10-01	9976
1979-01-01	11013
1979-04-01	12194
1979-07-01	13792
1979-10-01	13815
1980-01-01	12928
1980-04-01	14477
1980-07-01	14995
1980-10-01	15277
1981-01-01	14853
1981-04-01	14635
1981-07-01	16531
1981-10-01	18171
1982-01-01	18450
1982-04-01	18389
1982-07-01	18874
1982-10-01	21373
1983-01-01	22925
1983-04-01	24718
1983-07-01	25842
1983-10-01	27210
1984-01-01	30845
1984-04-01	31405
1984-07-01	32811
1984-10-01	33814
1985-01-01	38089
1985-04-01	41117
1985-07-01	49009
1985-10-01	54128
1986-01-01	60164
1986-04-01	69244
1986-07-01	79005
1986-10-01	86617
1987-01-01	96421
1987-04-01	105883
1987-07-01	118858
1987-10-01	134561
1988-01-01	135754
1988-04-01	136896
1988-07-01	149671
1988-10-01	160174
1989-01-01	171784
1989-04-01	198591
1989-07-01	215749
1989-10-01	237607
1990-01-01	247069
1990-04-01	251627
1990-07-01	270520
1990-10-01	282290
1991-01-01	278344
1991-04-01	284110
1991-07-01	302739
1991-10-01	320336
1992-01-01	312677
1992-04-01	321082
1992-07-01	322202
1992-10-01	310308
1993-01-01	299922
1993-04-01	287542
1993-07-01	278224
1993-10-01	266831
1994-01-01	274694
1994-04-01	274037
1994-07-01	267796
1994-10-01	256519
1995-01-01	271965
1995-04-01	267439
1995-07-01	237274
1995-10-01	229760
1996-01-01	222018
1996-04-01	214434
1996-07-01	209017
1996-10-01	196670
1997-01-01	182564
1997-04-01	181116
1997-07-01	169238
1997-10-01	154647
1998-01-01	141920
1998-04-01	130737
1998-07-01	128516
1998-10-01	133236
1999-01-01	127111
1999-04-01	124867
1999-07-01	131094
1999-10-01	124233
2000-01-01	114609
2000-04-01	112888
2000-07-01	108571
2000-10-01	104363
2001-01-01	97529
2001-04-01	97309
2001-07-01	97331
2001-10-01	94810
2002-01-01	95793
2002-04-01	106471
2002-07-01	103603
2002-10-01	103586
2003-01-01	103301
2003-04-01	104907
2003-07-01	106882
2003-10-01	118228
2004-01-01	123622
2004-04-01	128963
2004-07-01	129289
2004-10-01	139927
2005-01-01	139109
2005-04-01	137041
2005-07-01	141097
2005-10-01	137932
2006-01-01	141963
2006-04-01	147266
2006-07-01	146440
2006-10-01	148235
2007-01-01	147741
2007-04-01	147403
2007-07-01	155499
2007-10-01	163744
2008-01-01	177563
2008-04-01	174872
2008-07-01	171395
2008-10-01	181597
2009-01-01	165256
2009-04-01	164369
2009-07-01	171313
2009-10-01	166886
2010-01-01	168410
2010-04-01	165338
2010-07-01	180094
2010-10-01	181001
2011-01-01	181882
2011-04-01	177026
2011-07-01	178698
2011-10-01	174392
2012-01-01	176626
2012-04-01	173887
2012-07-01	186069
2012-10-01	179947
2013-01-01	181265
2013-04-01	182465
2013-07-01	202550
2013-10-01	201674
2014-01-01	210014
2014-04-01	224994
2014-07-01	232473
2014-10-01	234182
2015-01-01	239738
2015-04-01	239007
2015-07-01	245743
2015-10-01	252886
2016-01-01	266357
2016-04-01	287904
2016-07-01	301429
2016-10-01	299861
2017-01-01	315469
2017-04-01	334473
2017-07-01	376798
2017-10-01	394956
2018-01-01	403097
2018-04-01	403904