Quarter	Millions of US Dollars
1971-01-01	25
1971-04-01	25
1971-07-01	25
1971-10-01	25
1972-01-01	25
1972-04-01	25
1972-07-01	25
1972-10-01	55
1973-01-01	111
1973-04-01	136
1973-07-01	209
1973-10-01	197
1974-01-01	231
1974-04-01	291
1974-07-01	304
1974-10-01	366
1975-01-01	374
1975-04-01	401
1975-07-01	367
1975-10-01	412
1976-01-01	414
1976-04-01	411
1976-07-01	441
1976-10-01	449
1977-01-01	471
1977-04-01	479
1977-07-01	544
1977-10-01	593
1978-01-01	619
1978-04-01	700
1978-07-01	773
1978-10-01	775
1979-01-01	750
1979-04-01	795
1979-07-01	843
1979-10-01	898
1980-01-01	927
1980-04-01	1015
1980-07-01	1013
1980-10-01	1066
1981-01-01	1111
1981-04-01	1143
1981-07-01	1078
1981-10-01	1456
1982-01-01	1681
1982-04-01	1746
1982-07-01	1885
1982-10-01	2001
1983-01-01	2214
1983-04-01	2278
1983-07-01	2295
1983-10-01	2914
1984-01-01	2993
1984-04-01	2957
1984-07-01	3211
1984-10-01	3407
1985-01-01	3845
1985-04-01	4067
1985-07-01	4578
1985-10-01	5146
1986-01-01	5523
1986-04-01	6237
1986-07-01	7477
1986-10-01	7593
1987-01-01	7837
1987-04-01	8003
1987-07-01	7883
1987-10-01	8604
1988-01-01	8598
1988-04-01	8205
1988-07-01	7781
1988-10-01	7855
1989-01-01	7251
1989-04-01	7204
1989-07-01	8959
1989-10-01	9387
1990-01-01	9894
1990-04-01	10413
1990-07-01	11323
1990-10-01	11560
1991-01-01	10762
1991-04-01	11189
1991-07-01	12055
1991-10-01	12404
1992-01-01	12127
1992-04-01	12344
1992-07-01	13453
1992-10-01	13524
1993-01-01	16128
1993-04-01	16100
1993-07-01	16636
1993-10-01	16011
1994-01-01	15850
1994-04-01	16726
1994-07-01	16924
1994-10-01	16626
1995-01-01	18946
1995-04-01	19579
1995-07-01	19532
1995-10-01	21931
1996-01-01	23375
1996-04-01	24098
1996-07-01	25817
1996-10-01	28673
1997-01-01	32637
1997-04-01	36134
1997-07-01	38742
1997-10-01	40812
1998-01-01	42299
1998-04-01	45319
1998-07-01	51402
1998-10-01	51272
1999-01-01	53967
1999-04-01	54962
1999-07-01	59394
1999-10-01	63507
2000-01-01	64521
2000-04-01	68390
2000-07-01	65751
2000-10-01	71068
2001-01-01	76529
2001-04-01	81160
2001-07-01	83310
2001-10-01	88577
2002-01-01	92158
2002-04-01	104012
2002-07-01	104110
2002-10-01	115957
2003-01-01	131724
2003-04-01	152286
2003-07-01	165969
2003-10-01	211038
2004-01-01	232202
2004-04-01	251365
2004-07-01	285732
2004-10-01	352939
2005-01-01	373163
2005-04-01	399038
2005-07-01	414193
2005-10-01	456958
2006-01-01	507458
2006-04-01	589679
2006-07-01	668873
2006-10-01	777442
2007-01-01	856960
2007-04-01	959547
2007-07-01	1063643
2007-10-01	1119826
2008-01-01	1225469
2008-04-01	1266983
2008-07-01	1181332
2008-10-01	1190620
2009-01-01	1169758
2009-04-01	1269521
2009-07-01	1346033
2009-10-01	1313322
2010-01-01	1250307
2010-04-01	1153069
2010-07-01	1228115
2010-10-01	1198297
2011-01-01	1188982
2011-04-01	1190471
2011-07-01	1094392
2011-10-01	1055694
2012-01-01	1109796
2012-04-01	1044333
2012-07-01	1039378
2012-10-01	1062736
2013-01-01	1030563
2013-04-01	1024678
2013-07-01	1036308
2013-10-01	1055774
2014-01-01	1020584
2014-04-01	1010960
2014-07-01	927799
2014-10-01	855191
2015-01-01	752602
2015-04-01	807904
2015-07-01	795443
2015-10-01	790813
2016-01-01	807603
2016-04-01	786422
2016-07-01	788819
2016-10-01	745883
2017-01-01	756253
2017-04-01	791622
2017-07-01	827782
2017-10-01	845447
2018-01-01	860318
2018-04-01	829977