Quarter	Millions of US Dollars
1966-04-01	15
1966-07-01	30
1966-10-01	50
1967-01-01	75
1967-04-01	100
1967-07-01	120
1967-10-01	120
1968-01-01	120
1968-04-01	120
1968-07-01	120
1968-10-01	120
1969-01-01	120
1969-04-01	120
1969-07-01	120
1969-10-01	120
1970-01-01	161
1970-04-01	161
1970-07-01	361
1970-10-01	361
1971-01-01	433
1971-04-01	590
1971-07-01	620
1971-10-01	754
1972-01-01	1931
1972-04-01	2220
1972-07-01	2749
1972-10-01	3288
1973-01-01	4183
1973-04-01	5089
1973-07-01	5371
1973-10-01	5387
1974-01-01	5941
1974-04-01	6393
1974-07-01	6648
1974-10-01	8075
1975-01-01	8935
1975-04-01	9598
1975-07-01	9929
1975-10-01	12093
1976-01-01	14375
1976-04-01	15936
1976-07-01	18620
1976-10-01	20031
1977-01-01	21206
1977-04-01	22931
1977-07-01	25377
1977-10-01	27984
1978-01-01	30230
1978-04-01	31142
1978-07-01	36411
1978-10-01	38088
1979-01-01	37396
1979-04-01	39327
1979-07-01	42417
1979-10-01	43711
1980-01-01	41548
1980-04-01	46730
1980-07-01	47205
1980-10-01	46430
1981-01-01	45559
1981-04-01	44202
1981-07-01	46125
1981-10-01	50384
1982-01-01	48989
1982-04-01	48890
1982-07-01	51047
1982-10-01	55840
1983-01-01	57343
1983-04-01	60566
1983-07-01	61688
1983-10-01	63957
1984-01-01	67628
1984-04-01	66864
1984-07-01	66295
1984-10-01	68569
1985-01-01	72003
1985-04-01	75048
1985-07-01	84714
1985-10-01	88655
1986-01-01	98213
1986-04-01	103944
1986-07-01	109831
1986-10-01	112014
1987-01-01	123757
1987-04-01	123560
1987-07-01	124752
1987-10-01	143470
1988-01-01	142539
1988-04-01	134337
1988-07-01	132568
1988-10-01	141913
1989-01-01	139073
1989-04-01	137555
1989-07-01	144626
1989-10-01	153273
1990-01-01	156737
1990-04-01	166515
1990-07-01	177740
1990-10-01	189342
1991-01-01	182689
1991-04-01	182269
1991-07-01	197120
1991-10-01	216251
1992-01-01	213947
1992-04-01	231925
1992-07-01	241060
1992-10-01	225322
1993-01-01	236772
1993-04-01	241932
1993-07-01	261668
1993-10-01	256861
1994-01-01	267066
1994-04-01	274029
1994-07-01	280911
1994-10-01	283972
1995-01-01	306695
1995-04-01	312497
1995-07-01	305650
1995-10-01	304487
1996-01-01	302655
1996-04-01	305797
1996-07-01	308124
1996-10-01	312939
1997-01-01	305088
1997-04-01	312610
1997-07-01	309258
1997-10-01	307378
1998-01-01	325436
1998-04-01	334994
1998-07-01	356331
1998-10-01	375622
1999-01-01	374075
1999-04-01	373591
1999-07-01	391034
1999-10-01	381540
2000-01-01	378568
2000-04-01	381529
2000-07-01	370424
2000-10-01	384328
2001-01-01	370228
2001-04-01	370720
2001-07-01	393597
2001-10-01	386738
2002-01-01	392071
2002-04-01	423869
2002-07-01	431473
2002-10-01	440727
2003-01-01	454933
2003-04-01	482145
2003-07-01	492292
2003-10-01	510445
2004-01-01	518572
2004-04-01	519398
2004-07-01	530723
2004-10-01	559103
2005-01-01	550331
2005-04-01	540016
2005-07-01	557284
2005-10-01	547673
2006-01-01	556972
2006-04-01	572142
2006-07-01	568077
2006-10-01	590473
2007-01-01	601713
2007-04-01	623299
2007-07-01	652220
2007-10-01	664059
2008-01-01	706813
2008-04-01	710576
2008-07-01	675724
2008-10-01	660841
2009-01-01	671333
2009-04-01	776081
2009-07-01	814124
2009-10-01	811288
2010-01-01	832224
2010-04-01	832970
2010-07-01	900559
2010-10-01	903380
2011-01-01	988964
2011-04-01	1039422
2011-07-01	1059801
2011-10-01	1063176
2012-01-01	1269696
2012-04-01	1264153
2012-07-01	1331051
2012-10-01	1361640
2013-01-01	1328535
2013-04-01	1382990
2013-07-01	1445044
2013-10-01	1476600
2014-01-01	1550818
2014-04-01	1572536
2014-07-01	1529783
2014-10-01	1490711
2015-01-01	1419444
2015-04-01	1469491
2015-07-01	1472175
2015-10-01	1461496
2016-01-01	1550830
2016-04-01	1562331
2016-07-01	1567574
2016-10-01	1505620
2017-01-01	1579331
2017-04-01	1653466
2017-07-01	1706445
2017-10-01	1720386
2018-01-01	1793933
2018-04-01	1725184