Quarter	Millions of US Dollars
1967-04-01	25
1967-07-01	25
1967-10-01	25
1968-01-01	25
1968-04-01	55
1968-07-01	55
1968-10-01	75
1969-01-01	75
1969-04-01	75
1969-07-01	75
1969-10-01	75
1970-01-01	75
1970-04-01	75
1970-07-01	75
1970-10-01	75
1971-01-01	100
1971-04-01	172
1971-07-01	172
1971-10-01	172
1972-01-01	172
1972-04-01	172
1972-07-01	172
1972-10-01	222
1973-01-01	222
1973-04-01	222
1973-07-01	222
1973-10-01	222
1974-01-01	222
1974-04-01	222
1974-07-01	221
1974-10-01	225
1975-01-01	238
1975-04-01	247
1975-07-01	237
1975-10-01	239
1976-01-01	237
1976-04-01	236
1976-07-01	237
1976-10-01	238
1977-01-01	245
1977-04-01	334
1977-07-01	336
1977-10-01	423
1978-01-01	456
1978-04-01	483
1978-07-01	508
1978-10-01	506
1979-01-01	535
1979-04-01	538
1979-07-01	553
1979-10-01	587
1980-01-01	752
1980-04-01	1065
1980-07-01	1310
1980-10-01	1393
1981-01-01	1625
1981-04-01	1720
1981-07-01	1725
1981-10-01	2094
1982-01-01	2276
1982-04-01	2272
1982-07-01	2357
1982-10-01	2404
1983-01-01	2489
1983-04-01	2534
1983-07-01	2557
1983-10-01	2776
1984-01-01	3134
1984-04-01	3104
1984-07-01	3073
1984-10-01	3061
1985-01-01	4036
1985-04-01	4910
1985-07-01	5121
1985-10-01	5090
1986-01-01	5093
1986-04-01	5436
1986-07-01	5990
1986-10-01	5938
1987-01-01	6121
1987-04-01	5751
1987-07-01	5798
1987-10-01	6495
1988-01-01	6093
1988-04-01	6306
1988-07-01	6003
1988-10-01	6035
1989-01-01	5474
1989-04-01	5475
1989-07-01	6112
1989-10-01	6667
1990-01-01	6911
1990-04-01	6793
1990-07-01	7513
1990-10-01	8901
1991-01-01	8694
1991-04-01	8282
1991-07-01	8479
1991-10-01	8945
1992-01-01	9805
1992-04-01	11424
1992-07-01	10565
1992-10-01	9019
1993-01-01	8447
1993-04-01	7646
1993-07-01	7932
1993-10-01	7463
1994-01-01	7541
1994-04-01	7626
1994-07-01	7597
1994-10-01	7620
1995-01-01	7368
1995-04-01	7450
1995-07-01	7448
1995-10-01	7457
1996-01-01	7129
1996-04-01	7088
1996-07-01	6388
1996-10-01	5917
1997-01-01	5433
1997-04-01	5254
1997-07-01	5479
1997-10-01	5398
1998-01-01	4449
1998-04-01	4741
1998-07-01	5003
1998-10-01	6770
1999-01-01	5496
1999-04-01	5289
1999-07-01	5571
1999-10-01	7368
2000-01-01	7179
2000-04-01	8345
2000-07-01	8792
2000-10-01	10016
2001-01-01	9585
2001-04-01	9718
2001-07-01	10562
2001-10-01	10777
2002-01-01	12347
2002-04-01	14200
2002-07-01	14091
2002-10-01	15433
2003-01-01	15982
2003-04-01	19445
2003-07-01	19857
2003-10-01	23153
2004-01-01	26356
2004-04-01	36687
2004-07-01	38203
2004-10-01	46305
2005-01-01	46020
2005-04-01	42925
2005-07-01	41123
2005-10-01	34866
2006-01-01	38110
2006-04-01	43518
2006-07-01	43426
2006-10-01	47098
2007-01-01	45753
2007-04-01	55134
2007-07-01	57430
2007-10-01	61493
2008-01-01	65116
2008-04-01	64549
2008-07-01	58381
2008-10-01	54922
2009-01-01	57205
2009-04-01	64726
2009-07-01	69521
2009-10-01	73245
2010-01-01	77007
2010-04-01	70815
2010-07-01	80876
2010-10-01	83679
2011-01-01	91483
2011-04-01	90302
2011-07-01	83925
2011-10-01	81117
2012-01-01	86989
2012-04-01	85102
2012-07-01	95097
2012-10-01	105082
2013-01-01	106149
2013-04-01	113058
2013-07-01	130802
2013-10-01	146667
2014-01-01	150294
2014-04-01	148613
2014-07-01	143208
2014-10-01	136838
2015-01-01	126500
2015-04-01	130911
2015-07-01	131932
2015-10-01	128121
2016-01-01	123432
2016-04-01	124008
2016-07-01	128475
2016-10-01	121002
2017-01-01	127216
2017-04-01	136502
2017-07-01	145949
2017-10-01	160894
2018-01-01	164508
2018-04-01	156930