Quarter	Millions of US Dollars
1972-04-01	32
1972-07-01	31
1972-10-01	51
1973-01-01	55
1973-04-01	61
1973-07-01	61
1973-10-01	87
1974-01-01	89
1974-04-01	89
1974-07-01	88
1974-10-01	91
1975-01-01	93
1975-04-01	104
1975-07-01	100
1975-10-01	119
1976-01-01	121
1976-04-01	145
1976-07-01	209
1976-10-01	282
1977-01-01	344
1977-04-01	349
1977-07-01	382
1977-10-01	465
1978-01-01	506
1978-04-01	513
1978-07-01	540
1978-10-01	543
1979-01-01	552
1979-04-01	550
1979-07-01	559
1979-10-01	551
1980-01-01	524
1980-04-01	558
1980-07-01	557
1980-10-01	548
1981-01-01	607
1981-04-01	581
1981-07-01	552
1981-10-01	541
1982-01-01	518
1982-04-01	506
1982-07-01	558
1982-10-01	556
1983-01-01	486
1983-04-01	460
1983-07-01	462
1983-10-01	521
1984-01-01	525
1984-04-01	517
1984-07-01	497
1984-10-01	494
1985-01-01	498
1985-04-01	474
1985-07-01	493
1985-10-01	545
1986-01-01	474
1986-04-01	487
1986-07-01	498
1986-10-01	648
1987-01-01	707
1987-04-01	781
1987-07-01	781
1987-10-01	874
1988-01-01	968
1988-04-01	941
1988-07-01	939
1988-10-01	876
1989-01-01	849
1989-04-01	849
1989-07-01	781
1989-10-01	572
1990-01-01	640
1990-04-01	600
1990-07-01	600
1990-10-01	750
1991-01-01	784
1991-04-01	804
1991-07-01	856
1991-10-01	817
1992-01-01	855
1992-04-01	806
1992-07-01	807
1992-10-01	730
1993-01-01	731
1993-04-01	656
1993-07-01	796
1993-10-01	971
1994-01-01	1220
1994-04-01	1294
1994-07-01	1347
1994-10-01	1400
1995-01-01	1323
1995-04-01	1353
1995-07-01	1362
1995-10-01	1242
1996-01-01	1220
1996-04-01	1826
1996-07-01	1966
1996-10-01	3260
1997-01-01	3787
1997-04-01	4477
1997-07-01	5188
1997-10-01	5051
1998-01-01	4931
1998-04-01	7408
1998-07-01	7523
1998-10-01	7585
1999-01-01	8413
1999-04-01	8175
1999-07-01	9404
1999-10-01	10316
2000-01-01	10565
2000-04-01	13652
2000-07-01	14028
2000-10-01	14560
2001-01-01	15969
2001-04-01	16062
2001-07-01	18167
2001-10-01	20876
2002-01-01	21118
2002-04-01	19999
2002-07-01	19761
2002-10-01	20099
2003-01-01	20445
2003-04-01	21832
2003-07-01	23318
2003-10-01	27082
2004-01-01	28301
2004-04-01	30114
2004-07-01	31200
2004-10-01	34910
2005-01-01	35333
2005-04-01	35092
2005-07-01	37572
2005-10-01	38183
2006-01-01	37473
2006-04-01	41169
2006-07-01	42437
2006-10-01	42906
2007-01-01	42511
2007-04-01	45932
2007-07-01	47063
2007-10-01	47767
2008-01-01	49119
2008-04-01	50690
2008-07-01	51346
2008-10-01	49480
2009-01-01	47022
2009-04-01	45115
2009-07-01	47291
2009-10-01	49659
2010-01-01	51063
2010-04-01	49493
2010-07-01	54241
2010-10-01	54835
2011-01-01	58170
2011-04-01	62017
2011-07-01	62467
2011-10-01	64034
2012-01-01	71102
2012-04-01	68424
2012-07-01	75169
2012-10-01	79201
2013-01-01	83194
2013-04-01	86756
2013-07-01	93381
2013-10-01	95525
2014-01-01	96065
2014-04-01	99986
2014-07-01	103261
2014-10-01	95888
2015-01-01	91508
2015-04-01	95269
2015-07-01	89029
2015-10-01	87640
2016-01-01	90833
2016-04-01	87075
2016-07-01	89180
2016-10-01	84497
2017-01-01	88807
2017-04-01	91575
2017-07-01	101283
2017-10-01	102456
2018-01-01	115584
2018-04-01	124039