Quarter	Millions of US Dollars
1969-01-01	27
1969-04-01	45
1969-07-01	45
1969-10-01	95
1970-01-01	95
1970-04-01	96
1970-07-01	171
1970-10-01	171
1971-01-01	246
1971-04-01	249
1971-07-01	305
1971-10-01	392
1972-01-01	552
1972-04-01	1151
1972-07-01	1344
1972-10-01	1843
1973-01-01	2029
1973-04-01	2495
1973-07-01	2710
1973-10-01	3142
1974-01-01	3661
1974-04-01	4245
1974-07-01	4663
1974-10-01	5367
1975-01-01	6122
1975-04-01	7017
1975-07-01	7925
1975-10-01	10245
1976-01-01	13587
1976-04-01	15236
1976-07-01	17068
1976-10-01	19211
1977-01-01	20265
1977-04-01	21605
1977-07-01	23211
1977-10-01	24564
1978-01-01	26120
1978-04-01	27883
1978-07-01	29100
1978-10-01	30030
1979-01-01	31663
1979-04-01	32412
1979-07-01	33450
1979-10-01	33725
1980-01-01	33650
1980-04-01	35700
1980-07-01	35262
1980-10-01	35619
1981-01-01	36099
1981-04-01	37877
1981-07-01	40350
1981-10-01	44341
1982-01-01	47086
1982-04-01	48741
1982-07-01	51571
1982-10-01	53288
1983-01-01	54148
1983-04-01	56073
1983-07-01	56211
1983-10-01	57057
1984-01-01	58635
1984-04-01	59160
1984-07-01	59792
1984-10-01	60576
1985-01-01	61750
1985-04-01	63179
1985-07-01	66269
1985-10-01	67416
1986-01-01	71917
1986-04-01	76231
1986-07-01	80745
1986-10-01	83651
1987-01-01	86295
1987-04-01	87081
1987-07-01	87517
1987-10-01	92841
1988-01-01	92744
1988-04-01	93079
1988-07-01	94717
1988-10-01	98980
1989-01-01	99747
1989-04-01	98929
1989-07-01	100409
1989-10-01	102274
1990-01-01	103203
1990-04-01	106457
1990-07-01	108196
1990-10-01	110666
1991-01-01	112156
1991-04-01	116192
1991-07-01	119464
1991-10-01	125195
1992-01-01	124217
1992-04-01	130235
1992-07-01	132772
1992-10-01	131081
1993-01-01	142074
1993-04-01	145859
1993-07-01	150064
1993-10-01	148636
1994-01-01	155961
1994-04-01	160021
1994-07-01	168434
1994-10-01	165569
1995-01-01	171671
1995-04-01	174328
1995-07-01	178715
1995-10-01	176918
1996-01-01	176629
1996-04-01	177499
1996-07-01	179599
1996-10-01	182001
1997-01-01	183264
1997-04-01	188224
1997-07-01	189572
1997-10-01	185406
1998-01-01	189682
1998-04-01	193595
1998-07-01	198446
1998-10-01	204506
1999-01-01	202645
1999-04-01	209421
1999-07-01	213515
1999-10-01	214697
2000-01-01	213261
2000-04-01	207126
2000-07-01	204110
2000-10-01	204036
2001-01-01	204033
2001-04-01	207886
2001-07-01	212515
2001-10-01	217113
2002-01-01	224009
2002-04-01	234093
2002-07-01	237619
2002-10-01	243092
2003-01-01	245799
2003-04-01	260641
2003-07-01	267298
2003-10-01	286034
2004-01-01	284123
2004-04-01	278875
2004-07-01	292585
2004-10-01	306683
2005-01-01	304762
2005-04-01	306599
2005-07-01	307779
2005-10-01	315628
2006-01-01	320629
2006-04-01	326002
2006-07-01	334777
2006-10-01	347351
2007-01-01	359128
2007-04-01	386365
2007-07-01	399687
2007-10-01	421948
2008-01-01	426386
2008-04-01	477441
2008-07-01	476056
2008-10-01	438799
2009-01-01	443206
2009-04-01	487130
2009-07-01	506826
2009-10-01	533799
2010-01-01	543024
2010-04-01	558947
2010-07-01	589893
2010-10-01	619828
2011-01-01	641853
2011-04-01	666993
2011-07-01	643516
2011-10-01	663613
2012-01-01	698110
2012-04-01	681289
2012-07-01	707158
2012-10-01	708371
2013-01-01	705191
2013-04-01	690486
2013-07-01	738318
2013-10-01	760159
2014-01-01	762774
2014-04-01	781334
2014-07-01	781924
2014-10-01	774423
2015-01-01	777009
2015-04-01	778319
2015-07-01	787602
2015-10-01	776592
2016-01-01	808199
2016-04-01	828132
2016-07-01	841860
2016-10-01	823409
2017-01-01	840012
2017-04-01	875862
2017-07-01	892126
2017-10-01	911010
2018-01-01	938549
2018-04-01	938505