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	475
1979-04-01	658
1979-07-01	730
1979-10-01	810
1980-01-01	753
1980-04-01	817
1980-07-01	954
1980-10-01	954
1981-01-01	915
1981-04-01	966
1981-07-01	969
1981-10-01	1054
1982-01-01	994
1982-04-01	956
1982-07-01	909
1982-10-01	968
1983-01-01	953
1983-04-01	909
1983-07-01	905
1983-10-01	898
1984-01-01	921
1984-04-01	817
1984-07-01	751
1984-10-01	735
1985-01-01	691
1985-04-01	694
1985-07-01	762
1985-10-01	740
1986-01-01	694
1986-04-01	643
1986-07-01	676
1986-10-01	615
1987-01-01	779
1987-04-01	547
1987-07-01	532
1987-10-01	594
1988-01-01	559
1988-04-01	621
1988-07-01	512
1988-10-01	475
1989-01-01	445
1989-04-01	395
1989-07-01	368
1989-10-01	249
1990-01-01	217
1990-04-01	226
1990-07-01	72
1990-10-01	95
1991-01-01	92
1991-04-01	108
1991-07-01	111
1991-10-01	849
1992-01-01	1218
1992-04-01	1542
1992-07-01	2122
1992-10-01	2548
1993-01-01	2985
1993-04-01	20737
1993-07-01	21603
1993-10-01	33554
1994-01-01	35125
1994-04-01	35236
1994-07-01	36467
1994-10-01	38741
1995-01-01	38329
1995-04-01	40189
1995-07-01	41718
1995-10-01	44043
1996-01-01	45981
1996-04-01	49793
1996-07-01	51390
1996-10-01	54480
1997-01-01	59350
1997-04-01	61364
1997-07-01	67561
1997-10-01	67448
1998-01-01	70513
1998-04-01	77909
1998-07-01	80821
1998-10-01	75384
1999-01-01	75418
1999-04-01	79004
1999-07-01	81843
1999-10-01	83425
2000-01-01	87367
2000-04-01	91128
2000-07-01	91188
2000-10-01	90690
2001-01-01	90598
2001-04-01	94014
2001-07-01	95138
2001-10-01	93403
2002-01-01	90858
2002-04-01	93939
2002-07-01	92357
2002-10-01	93745
2003-01-01	93645
2003-04-01	94112
2003-07-01	93876
2003-10-01	96592
2004-01-01	95111
2004-04-01	92210
2004-07-01	91461
2004-10-01	94826
2005-01-01	92908
2005-04-01	60119
2005-07-01	59899
2005-10-01	59740
2006-01-01	60550
2006-04-01	61385
2006-07-01	61308
2006-10-01	62889
2007-01-01	62811
2007-04-01	64784
2007-07-01	67290
2007-10-01	68723
2008-01-01	69047
2008-04-01	67102
2008-07-01	63973
2008-10-01	56240
2009-01-01	54332
2009-04-01	54569
2009-07-01	53302
2009-10-01	52549
2010-01-01	50680
2010-04-01	50057
2010-07-01	53017
2010-10-01	53416
2011-01-01	56064
2011-04-01	56575
2011-07-01	54439
2011-10-01	53158
2012-01-01	53301
2012-04-01	51621
2012-07-01	52108
2012-10-01	52415
2013-01-01	51646
2013-04-01	52071
2013-07-01	52767
2013-10-01	53031
2014-01-01	52913
2014-04-01	53664
2014-07-01	51579
2014-10-01	50108
2015-01-01	49436
2015-04-01	50904
2015-07-01	50968
2015-10-01	49633
2016-01-01	53047
2016-04-01	72701
2016-07-01	79104
2016-10-01	82647
2017-01-01	95342
2017-04-01	109928
2017-07-01	112026
2017-10-01	118598
2018-01-01	129493
2018-04-01	125363