Quarter	Millions of US Dollars
1969-10-01	50
1970-01-01	77
1970-04-01	78
1970-07-01	78
1970-10-01	77
1971-01-01	89
1971-04-01	90
1971-07-01	92
1971-10-01	92
1972-01-01	93
1972-04-01	120
1972-07-01	119
1972-10-01	120
1973-01-01	130
1973-04-01	156
1973-07-01	156
1973-10-01	147
1974-01-01	158
1974-04-01	178
1974-07-01	175
1974-10-01	191
1975-01-01	193
1975-04-01	193
1975-07-01	197
1975-10-01	202
1976-01-01	206
1976-04-01	200
1976-07-01	278
1976-10-01	354
1977-01-01	390
1977-04-01	407
1977-07-01	540
1977-10-01	575
1978-01-01	615
1978-04-01	614
1978-07-01	679
1978-10-01	677
1979-01-01	691
1979-04-01	696
1979-07-01	1698
1979-10-01	2219
1980-01-01	2003
1980-04-01	2299
1980-07-01	2264
1980-10-01	2148
1981-01-01	2154
1981-04-01	1966
1981-07-01	1995
1981-10-01	2203
1982-01-01	2122
1982-04-01	2097
1982-07-01	2061
1982-10-01	2237
1983-01-01	2386
1983-04-01	2369
1983-07-01	2360
1983-10-01	2696
1984-01-01	2871
1984-04-01	2923
1984-07-01	3237
1984-10-01	3660
1985-01-01	4239
1985-04-01	4690
1985-07-01	5905
1985-10-01	6300
1986-01-01	7620
1986-04-01	8699
1986-07-01	9928
1986-10-01	10599
1987-01-01	11432
1987-04-01	11958
1987-07-01	12628
1987-10-01	13695
1988-01-01	14237
1988-04-01	14237
1988-07-01	15569
1988-10-01	16309
1989-01-01	16745
1989-04-01	16947
1989-07-01	17525
1989-10-01	18774
1990-01-01	19792
1990-04-01	22295
1990-07-01	23355
1990-10-01	25235
1991-01-01	27071
1991-04-01	28656
1991-07-01	30876
1991-10-01	35055
1992-01-01	34768
1992-04-01	38345
1992-07-01	39842
1992-10-01	37551
1993-01-01	38518
1993-04-01	39428
1993-07-01	46985
1993-10-01	48139
1994-01-01	50396
1994-04-01	52240
1994-07-01	56361
1994-10-01	58584
1995-01-01	65163
1995-04-01	68709
1995-07-01	70694
1995-10-01	74375
1996-01-01	74208
1996-04-01	75167
1996-07-01	76362
1996-10-01	78558
1997-01-01	77175
1997-04-01	78944
1997-07-01	81425
1997-10-01	80991
1998-01-01	82056
1998-04-01	82066
1998-07-01	84534
1998-10-01	85647
1999-01-01	84130
1999-04-01	83720
1999-07-01	88512
1999-10-01	85779
2000-01-01	86079
2000-04-01	89046
2000-07-01	83012
2000-10-01	89017
2001-01-01	92728
2001-04-01	96672
2001-07-01	101510
2001-10-01	96823
2002-01-01	100770
2002-04-01	115941
2002-07-01	116883
2002-10-01	122585
2003-01-01	133481
2003-04-01	138859
2003-07-01	142008
2003-10-01	155638
2004-01-01	156537
2004-04-01	150876
2004-07-01	163743
2004-10-01	180692
2005-01-01	172584
2005-04-01	171025
2005-07-01	175923
2005-10-01	174295
2006-01-01	189708
2006-04-01	199540
2006-07-01	194982
2006-10-01	222315
2007-01-01	238727
2007-04-01	255642
2007-07-01	272556
2007-10-01	294360
2008-01-01	315036
2008-04-01	339475
2008-07-01	308001
2008-10-01	320177
2009-01-01	329906
2009-04-01	369847
2009-07-01	388319
2009-10-01	388361
2010-01-01	390931
2010-04-01	373364
2010-07-01	418931
2010-10-01	407606
2011-01-01	422133
2011-04-01	427136
2011-07-01	386680
2011-10-01	358871
2012-01-01	353479
2012-04-01	335083
2012-07-01	343049
2012-10-01	346507
2013-01-01	317250
2013-04-01	314837
2013-07-01	336382
2013-10-01	376569
2014-01-01	343616
2014-04-01	330558
2014-07-01	309784
2014-10-01	303302
2015-01-01	287632
2015-04-01	297781
2015-07-01	292902
2015-10-01	293766
2016-01-01	317563
2016-04-01	312169
2016-07-01	315173
2016-10-01	295799
2017-01-01	296387
2017-04-01	316139
2017-07-01	326042
2017-10-01	333175
2018-01-01	346085
2018-04-01	332516