Quarter	Millions of US Dollars
1971-01-01	30
1971-04-01	64
1971-07-01	65
1971-10-01	90
1972-01-01	166
1972-04-01	198
1972-07-01	298
1972-10-01	341
1973-01-01	363
1973-04-01	384
1973-07-01	387
1973-10-01	370
1974-01-01	379
1974-04-01	393
1974-07-01	458
1974-10-01	507
1975-01-01	724
1975-04-01	994
1975-07-01	944
1975-10-01	1039
1976-01-01	1145
1976-04-01	1380
1976-07-01	1810
1976-10-01	2099
1977-01-01	2158
1977-04-01	2235
1977-07-01	2683
1977-10-01	3138
1978-01-01	3793
1978-04-01	4046
1978-07-01	4565
1978-10-01	4857
1979-01-01	5027
1979-04-01	5081
1979-07-01	5198
1979-10-01	5302
1980-01-01	5254
1980-04-01	5461
1980-07-01	5469
1980-10-01	5382
1981-01-01	5311
1981-04-01	5130
1981-07-01	5240
1981-10-01	5706
1982-01-01	5524
1982-04-01	5556
1982-07-01	6280
1982-10-01	6851
1983-01-01	6964
1983-04-01	6968
1983-07-01	7436
1983-10-01	8070
1984-01-01	8906
1984-04-01	9382
1984-07-01	9615
1984-10-01	10215
1985-01-01	11014
1985-04-01	12111
1985-07-01	14393
1985-10-01	16138
1986-01-01	18880
1986-04-01	21035
1986-07-01	22716
1986-10-01	25588
1987-01-01	35485
1987-04-01	37603
1987-07-01	41126
1987-10-01	44884
1988-01-01	43395
1988-04-01	45138
1988-07-01	47418
1988-10-01	51601
1989-01-01	54477
1989-04-01	52585
1989-07-01	57132
1989-10-01	59007
1990-01-01	61174
1990-04-01	61354
1990-07-01	66013
1990-10-01	65236
1991-01-01	66101
1991-04-01	62336
1991-07-01	65458
1991-10-01	66461
1992-01-01	64267
1992-04-01	65235
1992-07-01	67147
1992-10-01	62664
1993-01-01	62062
1993-04-01	63651
1993-07-01	58911
1993-10-01	58989
1994-01-01	61998
1994-04-01	62494
1994-07-01	64013
1994-10-01	67218
1995-01-01	71173
1995-04-01	70085
1995-07-01	72638
1995-10-01	73568
1996-01-01	73766
1996-04-01	75296
1996-07-01	78300
1996-10-01	81849
1997-01-01	83033
1997-04-01	86349
1997-07-01	83440
1997-10-01	76232
1998-01-01	78148
1998-04-01	76728
1998-07-01	78044
1998-10-01	79742
1999-01-01	82181
1999-04-01	82233
1999-07-01	88985
1999-10-01	90273
2000-01-01	94724
2000-04-01	99679
2000-07-01	100237
2000-10-01	102279
2001-01-01	98319
2001-04-01	104229
2001-07-01	109022
2001-10-01	105772
2002-01-01	109445
2002-04-01	114645
2002-07-01	119752
2002-10-01	127354
2003-01-01	132599
2003-04-01	147048
2003-07-01	160692
2003-10-01	177761
2004-01-01	194050
2004-04-01	198159
2004-07-01	222965
2004-10-01	242880
2005-01-01	250271
2005-04-01	263689
2005-07-01	260434
2005-10-01	273955
2006-01-01	300346
2006-04-01	325490
2006-07-01	341853
2006-10-01	375525
2007-01-01	400213
2007-04-01	431444
2007-07-01	456724
2007-10-01	458830
2008-01-01	515342
2008-04-01	510243
2008-07-01	475196
2008-10-01	443290
2009-01-01	424619
2009-04-01	461550
2009-07-01	485728
2009-10-01	519830
2010-01-01	522490
2010-04-01	509161
2010-07-01	545021
2010-10-01	558682
2011-01-01	567596
2011-04-01	588695
2011-07-01	569155
2011-10-01	560530
2012-01-01	577868
2012-04-01	566868
2012-07-01	611907
2012-10-01	607615
2013-01-01	602663
2013-04-01	597408
2013-07-01	615021
2013-10-01	636380
2014-01-01	639922
2014-04-01	647888
2014-07-01	625892
2014-10-01	615591
2015-01-01	599662
2015-04-01	617398
2015-07-01	596903
2015-10-01	606420
2016-01-01	627006
2016-04-01	632976
2016-07-01	644557
2016-10-01	617186
2017-01-01	624173
2017-04-01	640753
2017-07-01	659693
2017-10-01	658973
2018-01-01	676502
2018-04-01	656727