Quarter	Millions of US Dollars
1972-04-01	11
1972-07-01	11
1972-10-01	11
1973-01-01	12
1973-04-01	14
1973-07-01	14
1973-10-01	12
1974-01-01	13
1974-04-01	13
1974-07-01	13
1974-10-01	14
1975-01-01	14
1975-04-01	14
1975-07-01	13
1975-10-01	30
1976-01-01	30
1976-04-01	30
1976-07-01	398
1976-10-01	410
1977-01-01	435
1977-04-01	435
1977-07-01	435
1977-10-01	436
1978-01-01	437
1978-04-01	437
1978-07-01	438
1978-10-01	439
1979-01-01	468
1979-04-01	468
1979-07-01	469
1979-10-01	469
1980-01-01	468
1980-04-01	470
1980-07-01	469
1980-10-01	468
1981-01-01	466
1981-04-01	464
1981-07-01	507
1981-10-01	629
1982-01-01	661
1982-04-01	657
1982-07-01	652
1982-10-01	764
1983-01-01	760
1983-04-01	759
1983-07-01	871
1983-10-01	936
1984-01-01	938
1984-04-01	979
1984-07-01	1035
1984-10-01	1026
1985-01-01	1517
1985-04-01	1699
1985-07-01	1777
1985-10-01	1999
1986-01-01	2210
1986-04-01	2430
1986-07-01	2499
1986-10-01	2573
1987-01-01	2739
1987-04-01	2779
1987-07-01	2976
1987-10-01	3219
1988-01-01	3175
1988-04-01	3184
1988-07-01	3329
1988-10-01	3510
1989-01-01	3389
1989-04-01	3389
1989-07-01	3329
1989-10-01	3555
1990-01-01	3826
1990-04-01	3871
1990-07-01	4231
1990-10-01	4603
1991-01-01	4549
1991-04-01	5090
1991-07-01	5282
1991-10-01	5996
1992-01-01	5805
1992-04-01	6061
1992-07-01	6940
1992-10-01	7456
1993-01-01	7607
1993-04-01	8277
1993-07-01	9496
1993-10-01	13410
1994-01-01	14802
1994-04-01	17582
1994-07-01	19747
1994-10-01	20823
1995-01-01	20971
1995-04-01	22042
1995-07-01	24466
1995-10-01	24939
1996-01-01	26693
1996-04-01	29389
1996-07-01	31412
1996-10-01	35943
1997-01-01	38382
1997-04-01	42776
1997-07-01	45805
1997-10-01	46921
1998-01-01	46912
1998-04-01	47593
1998-07-01	47023
1998-10-01	47295
1999-01-01	46868
1999-04-01	46715
1999-07-01	46805
1999-10-01	46005
2000-01-01	47198
2000-04-01	46404
2000-07-01	46242
2000-10-01	45379
2001-01-01	44739
2001-04-01	46308
2001-07-01	46769
2001-10-01	46929
2002-01-01	48591
2002-04-01	51501
2002-07-01	51307
2002-10-01	51353
2003-01-01	52340
2003-04-01	53557
2003-07-01	55590
2003-10-01	55285
2004-01-01	57534
2004-04-01	60265
2004-07-01	61152
2004-10-01	62522
2005-01-01	62417
2005-04-01	63919
2005-07-01	66165
2005-10-01	67426
2006-01-01	68405
2006-04-01	69938
2006-07-01	71326
2006-10-01	72689
2007-01-01	73073
2007-04-01	77716
2007-07-01	77776
2007-10-01	79890
2008-01-01	80041
2008-04-01	78963
2008-07-01	77613
2008-10-01	75941
2009-01-01	74517
2009-04-01	76368
2009-07-01	78957
2009-10-01	84306
2010-01-01	83968
2010-04-01	84213
2010-07-01	85478
2010-10-01	92378
2011-01-01	92368
2011-04-01	98566
2011-07-01	100555
2011-10-01	100799
2012-01-01	102517
2012-04-01	104707
2012-07-01	107407
2012-10-01	110596
2013-01-01	116871
2013-04-01	123337
2013-07-01	127889
2013-10-01	134746
2014-01-01	138086
2014-04-01	142851
2014-07-01	145690
2014-10-01	149557
2015-01-01	149501
2015-04-01	155733
2015-07-01	154252
2015-10-01	150062
2016-01-01	151780
2016-04-01	154031
2016-07-01	158373
2016-10-01	158674
2017-01-01	165667
2017-04-01	173172
2017-07-01	177201
2017-10-01	182117
2018-01-01	187010
2018-04-01	192355