Quarter	Millions of US Dollars
1969-01-01	27
1969-04-01	45
1969-07-01	45
1969-10-01	45
1970-01-01	45
1970-04-01	46
1970-07-01	121
1970-10-01	121
1971-01-01	141
1971-04-01	142
1971-07-01	167
1971-10-01	199
1972-01-01	201
1972-04-01	583
1972-07-01	728
1972-10-01	909
1973-01-01	992
1973-04-01	1256
1973-07-01	1304
1973-10-01	1569
1974-01-01	1853
1974-04-01	2058
1974-07-01	2171
1974-10-01	2542
1975-01-01	2933
1975-04-01	3714
1975-07-01	3788
1975-10-01	4521
1976-01-01	5063
1976-04-01	5464
1976-07-01	6258
1976-10-01	6839
1977-01-01	7439
1977-04-01	8145
1977-07-01	8667
1977-10-01	9282
1978-01-01	10273
1978-04-01	11367
1978-07-01	12038
1978-10-01	12756
1979-01-01	13839
1979-04-01	13956
1979-07-01	14437
1979-10-01	14426
1980-01-01	14139
1980-04-01	14579
1980-07-01	14431
1980-10-01	14200
1981-01-01	13967
1981-04-01	14669
1981-07-01	15354
1981-10-01	17140
1982-01-01	18397
1982-04-01	19176
1982-07-01	20439
1982-10-01	21189
1983-01-01	21283
1983-04-01	22301
1983-07-01	22066
1983-10-01	23074
1984-01-01	23931
1984-04-01	24140
1984-07-01	24467
1984-10-01	24704
1985-01-01	25558
1985-04-01	26000
1985-07-01	27076
1985-10-01	27469
1986-01-01	29878
1986-04-01	31961
1986-07-01	33424
1986-10-01	35469
1987-01-01	36142
1987-04-01	35725
1987-07-01	35632
1987-10-01	37991
1988-01-01	37680
1988-04-01	36932
1988-07-01	37119
1988-10-01	38613
1989-01-01	38689
1989-04-01	37501
1989-07-01	37244
1989-10-01	37461
1990-01-01	37528
1990-04-01	38391
1990-07-01	39907
1990-10-01	41550
1991-01-01	41995
1991-04-01	45086
1991-07-01	47615
1991-10-01	49616
1992-01-01	49975
1992-04-01	52938
1992-07-01	54494
1992-10-01	55726
1993-01-01	63855
1993-04-01	65932
1993-07-01	70846
1993-10-01	70880
1994-01-01	77746
1994-04-01	81041
1994-07-01	87329
1994-10-01	85776
1995-01-01	89846
1995-04-01	92427
1995-07-01	95595
1995-10-01	94522
1996-01-01	96118
1996-04-01	93807
1996-07-01	94487
1996-10-01	94639
1997-01-01	94617
1997-04-01	95344
1997-07-01	95973
1997-10-01	91572
1998-01-01	93864
1998-04-01	91907
1998-07-01	95023
1998-10-01	100738
1999-01-01	97537
1999-04-01	97010
1999-07-01	97189
1999-10-01	98387
2000-01-01	95323
2000-04-01	90992
2000-07-01	88075
2000-10-01	86826
2001-01-01	84657
2001-04-01	83802
2001-07-01	84561
2001-10-01	83345
2002-01-01	82979
2002-04-01	85028
2002-07-01	83301
2002-10-01	86519
2003-01-01	83477
2003-04-01	87508
2003-07-01	88468
2003-10-01	88726
2004-01-01	86958
2004-04-01	84136
2004-07-01	86551
2004-10-01	88645
2005-01-01	89407
2005-04-01	89306
2005-07-01	86609
2005-10-01	87508
2006-01-01	84510
2006-04-01	85868
2006-07-01	84830
2006-10-01	86817
2007-01-01	88123
2007-04-01	89111
2007-07-01	87691
2007-10-01	86122
2008-01-01	86439
2008-04-01	90158
2008-07-01	84232
2008-10-01	78844
2009-01-01	77006
2009-04-01	88902
2009-07-01	90207
2009-10-01	98827
2010-01-01	101536
2010-04-01	108444
2010-07-01	115102
2010-10-01	116264
2011-01-01	119614
2011-04-01	124603
2011-07-01	125782
2011-10-01	122485
2012-01-01	124211
2012-04-01	128446
2012-07-01	130305
2012-10-01	129563
2013-01-01	127112
2013-04-01	123146
2013-07-01	127473
2013-10-01	126376
2014-01-01	129437
2014-04-01	129572
2014-07-01	125387
2014-10-01	124675
2015-01-01	123064
2015-04-01	115270
2015-07-01	115341
2015-10-01	116717
2016-01-01	119475
2016-04-01	118865
2016-07-01	118134
2016-10-01	115217
2017-01-01	117914
2017-04-01	126500
2017-07-01	131151
2017-10-01	133481
2018-01-01	134789
2018-04-01	131030