Quarter	Millions of US Dollars
1969-10-01	50
1970-01-01	50
1970-04-01	50
1970-07-01	50
1970-10-01	50
1971-01-01	105
1971-04-01	107
1971-07-01	137
1971-10-01	193
1972-01-01	350
1972-04-01	517
1972-07-01	551
1972-10-01	857
1973-01-01	961
1973-04-01	1163
1973-07-01	1328
1973-10-01	1496
1974-01-01	1700
1974-04-01	2036
1974-07-01	2323
1974-10-01	2647
1975-01-01	3011
1975-04-01	3124
1975-07-01	3711
1975-10-01	4955
1976-01-01	7420
1976-04-01	8307
1976-07-01	9029
1976-10-01	10333
1977-01-01	10770
1977-04-01	11288
1977-07-01	12303
1977-10-01	13067
1978-01-01	13670
1978-04-01	14214
1978-07-01	14695
1978-10-01	14763
1979-01-01	15059
1979-04-01	15601
1979-07-01	15954
1979-10-01	16254
1980-01-01	16247
1980-04-01	17081
1980-07-01	16865
1980-10-01	17387
1981-01-01	17855
1981-04-01	18510
1981-07-01	20108
1981-10-01	21864
1982-01-01	23065
1982-04-01	23573
1982-07-01	24779
1982-10-01	25567
1983-01-01	26128
1983-04-01	26720
1983-07-01	26990
1983-10-01	26703
1984-01-01	27356
1984-04-01	27526
1984-07-01	27452
1984-10-01	27528
1985-01-01	27518
1985-04-01	28195
1985-07-01	29126
1985-10-01	29208
1986-01-01	30567
1986-04-01	31438
1986-07-01	32352
1986-10-01	32201
1987-01-01	33191
1987-04-01	33644
1987-07-01	33419
1987-10-01	35101
1988-01-01	34419
1988-04-01	34097
1988-07-01	33683
1988-10-01	33846
1989-01-01	33842
1989-04-01	33850
1989-07-01	34466
1989-10-01	34793
1990-01-01	35850
1990-04-01	37634
1990-07-01	37903
1990-10-01	38918
1991-01-01	42013
1991-04-01	43671
1991-07-01	44734
1991-10-01	47914
1992-01-01	47806
1992-04-01	51300
1992-07-01	52544
1992-10-01	51326
1993-01-01	53969
1993-04-01	56014
1993-07-01	57187
1993-10-01	56226
1994-01-01	56935
1994-04-01	57019
1994-07-01	58864
1994-10-01	58186
1995-01-01	59284
1995-04-01	58630
1995-07-01	60312
1995-10-01	59524
1996-01-01	57618
1996-04-01	58534
1996-07-01	58441
1996-10-01	59187
1997-01-01	59147
1997-04-01	60832
1997-07-01	61107
1997-10-01	61154
1998-01-01	61155
1998-04-01	63878
1998-07-01	65974
1998-10-01	66211
1999-01-01	64345
1999-04-01	66800
1999-07-01	70595
1999-10-01	70558
2000-01-01	70545
2000-04-01	70439
2000-07-01	72380
2000-10-01	72261
2001-01-01	75600
2001-04-01	80553
2001-07-01	83435
2001-10-01	87058
2002-01-01	89746
2002-04-01	91279
2002-07-01	91009
2002-10-01	90130
2003-01-01	91815
2003-04-01	93064
2003-07-01	92616
2003-10-01	98693
2004-01-01	97949
2004-04-01	98164
2004-07-01	100332
2004-10-01	104489
2005-01-01	103860
2005-04-01	104912
2005-07-01	103962
2005-10-01	104415
2006-01-01	103316
2006-04-01	101992
2006-07-01	103825
2006-10-01	106668
2007-01-01	110997
2007-04-01	114396
2007-07-01	118445
2007-10-01	123885
2008-01-01	119202
2008-04-01	128106
2008-07-01	134188
2008-10-01	131625
2009-01-01	135111
2009-04-01	147213
2009-07-01	151823
2009-10-01	155747
2010-01-01	157011
2010-04-01	155923
2010-07-01	164248
2010-10-01	170667
2011-01-01	171244
2011-04-01	174969
2011-07-01	167711
2011-10-01	171171
2012-01-01	175584
2012-04-01	177954
2012-07-01	183966
2012-10-01	191542
2013-01-01	194617
2013-04-01	201618
2013-07-01	207490
2013-10-01	217465
2014-01-01	222786
2014-04-01	225709
2014-07-01	227630
2014-10-01	233765
2015-01-01	244146
2015-04-01	243187
2015-07-01	242358
2015-10-01	242716
2016-01-01	243627
2016-04-01	246198
2016-07-01	247533
2016-10-01	253029
2017-01-01	263679
2017-04-01	269706
2017-07-01	276091
2017-10-01	279916
2018-01-01	283500
2018-04-01	283988