Quarter	Millions of US Dollars
1975-04-01	16
1975-07-01	16
1975-10-01	16
1976-01-01	16
1976-04-01	16
1976-07-01	16
1976-10-01	16
1977-01-01	16
1977-04-01	16
1977-07-01	84
1977-10-01	88
1978-01-01	180
1978-04-01	280
1978-07-01	295
1978-10-01	383
1979-01-01	540
1979-04-01	723
1979-07-01	795
1979-10-01	875
1980-01-01	818
1980-04-01	882
1980-07-01	1019
1980-10-01	1019
1981-01-01	980
1981-04-01	1031
1981-07-01	1119
1981-10-01	1304
1982-01-01	1344
1982-04-01	1306
1982-07-01	1259
1982-10-01	1318
1983-01-01	1303
1983-04-01	1259
1983-07-01	1255
1983-10-01	1248
1984-01-01	1271
1984-04-01	1167
1984-07-01	1101
1984-10-01	1085
1985-01-01	1041
1985-04-01	1044
1985-07-01	1112
1985-10-01	1090
1986-01-01	1044
1986-04-01	993
1986-07-01	1026
1986-10-01	865
1987-01-01	929
1987-04-01	697
1987-07-01	682
1987-10-01	744
1988-01-01	709
1988-04-01	771
1988-07-01	662
1988-10-01	625
1989-01-01	595
1989-04-01	545
1989-07-01	433
1989-10-01	314
1990-01-01	282
1990-04-01	291
1990-07-01	137
1990-10-01	160
1991-01-01	157
1991-04-01	223
1991-07-01	226
1991-10-01	964
1992-01-01	1163
1992-04-01	1397
1992-07-01	1977
1992-10-01	2403
1993-01-01	2875
1993-04-01	20527
1993-07-01	21578
1993-10-01	33352
1994-01-01	34781
1994-04-01	34805
1994-07-01	36096
1994-10-01	38577
1995-01-01	37862
1995-04-01	39764
1995-07-01	41367
1995-10-01	43960
1996-01-01	45712
1996-04-01	49353
1996-07-01	51111
1996-10-01	54416
1997-01-01	58697
1997-04-01	60882
1997-07-01	66429
1997-10-01	66225
1998-01-01	68949
1998-04-01	75965
1998-07-01	79033
1998-10-01	73247
1999-01-01	73259
1999-04-01	76288
1999-07-01	79240
1999-10-01	80689
2000-01-01	84363
2000-04-01	87314
2000-07-01	87590
2000-10-01	87055
2001-01-01	86874
2001-04-01	90748
2001-07-01	91990
2001-10-01	90181
2002-01-01	88238
2002-04-01	91318
2002-07-01	89695
2002-10-01	91255
2003-01-01	91397
2003-04-01	92260
2003-07-01	92296
2003-10-01	94795
2004-01-01	93309
2004-04-01	90163
2004-07-01	89591
2004-10-01	93225
2005-01-01	91495
2005-04-01	58604
2005-07-01	58263
2005-10-01	57738
2006-01-01	58517
2006-04-01	59539
2006-07-01	59207
2006-10-01	60763
2007-01-01	60671
2007-04-01	61515
2007-07-01	61974
2007-10-01	63373
2008-01-01	63687
2008-04-01	61723
2008-07-01	58574
2008-10-01	51311
2009-01-01	49422
2009-04-01	49920
2009-07-01	50848
2009-10-01	50525
2010-01-01	48673
2010-04-01	47685
2010-07-01	50747
2010-10-01	51041
2011-01-01	53734
2011-04-01	54030
2011-07-01	52124
2011-10-01	51135
2012-01-01	51538
2012-04-01	49979
2012-07-01	50465
2012-10-01	50776
2013-01-01	50420
2013-04-01	51009
2013-07-01	52068
2013-10-01	52230
2014-01-01	52123
2014-04-01	53216
2014-07-01	51503
2014-10-01	49837
2015-01-01	49132
2015-04-01	50603
2015-07-01	50591
2015-10-01	49263
2016-01-01	52684
2016-04-01	71865
2016-07-01	78014
2016-10-01	81689
2017-01-01	94002
2017-04-01	108961
2017-07-01	111553
2017-10-01	117813
2018-01-01	128793
2018-04-01	124170