Quarter	Millions of US Dollars
1972-07-01	50
1972-10-01	50
1973-01-01	50
1973-04-01	80
1973-07-01	80
1973-10-01	80
1974-01-01	80
1974-04-01	131
1974-07-01	131
1974-10-01	132
1975-01-01	193
1975-04-01	275
1975-07-01	268
1975-10-01	288
1976-01-01	332
1976-04-01	401
1976-07-01	422
1976-10-01	460
1977-01-01	529
1977-04-01	550
1977-07-01	701
1977-10-01	825
1978-01-01	834
1978-04-01	911
1978-07-01	929
1978-10-01	936
1979-01-01	925
1979-04-01	1047
1979-07-01	1113
1979-10-01	1108
1980-01-01	1052
1980-04-01	1142
1980-07-01	1152
1980-10-01	1138
1981-01-01	1088
1981-04-01	938
1981-07-01	939
1981-10-01	919
1982-01-01	896
1982-04-01	886
1982-07-01	844
1982-10-01	843
1983-01-01	776
1983-04-01	712
1983-07-01	678
1983-10-01	658
1984-01-01	664
1984-04-01	582
1984-07-01	596
1984-10-01	590
1985-01-01	763
1985-04-01	743
1985-07-01	942
1985-10-01	893
1986-01-01	1109
1986-04-01	1537
1986-07-01	1652
1986-10-01	1738
1987-01-01	2446
1987-04-01	2372
1987-07-01	2354
1987-10-01	3036
1988-01-01	3826
1988-04-01	4032
1988-07-01	4497
1988-10-01	5472
1989-01-01	6078
1989-04-01	6176
1989-07-01	7480
1989-10-01	8244
1990-01-01	8775
1990-04-01	9158
1990-07-01	10181
1990-10-01	11240
1991-01-01	10458
1991-04-01	10418
1991-07-01	11243
1991-10-01	13548
1992-01-01	13569
1992-04-01	14557
1992-07-01	16689
1992-10-01	16247
1993-01-01	19057
1993-04-01	20602
1993-07-01	23165
1993-10-01	24142
1994-01-01	26738
1994-04-01	28012
1994-07-01	34030
1994-10-01	40278
1995-01-01	42688
1995-04-01	43414
1995-07-01	42454
1995-10-01	42373
1996-01-01	41924
1996-04-01	43066
1996-07-01	40807
1996-10-01	40301
1997-01-01	41063
1997-04-01	46250
1997-07-01	48510
1997-10-01	47991
1998-01-01	49848
1998-04-01	55418
1998-07-01	62413
1998-10-01	62167
1999-01-01	61603
1999-04-01	61245
1999-07-01	62517
1999-10-01	64505
2000-01-01	65424
2000-04-01	68535
2000-07-01	87923
2000-10-01	88015
2001-01-01	87184
2001-04-01	86639
2001-07-01	88541
2001-10-01	88060
2002-01-01	89025
2002-04-01	93849
2002-07-01	94337
2002-10-01	97703
2003-01-01	104104
2003-04-01	106056
2003-07-01	110595
2003-10-01	115404
2004-01-01	116892
2004-04-01	122768
2004-07-01	126659
2004-10-01	135026
2005-01-01	140920
2005-04-01	147480
2005-07-01	143393
2005-10-01	146954
2006-01-01	158059
2006-04-01	161017
2006-07-01	165935
2006-10-01	180543
2007-01-01	192055
2007-04-01	198363
2007-07-01	203410
2007-10-01	209920
2008-01-01	216465
2008-04-01	229366
2008-07-01	224413
2008-10-01	220073
2009-01-01	213723
2009-04-01	227172
2009-07-01	233457
2009-10-01	238968
2010-01-01	236345
2010-04-01	235251
2010-07-01	258813
2010-10-01	261558
2011-01-01	282887
2011-04-01	298101
2011-07-01	289437
2011-10-01	284481
2012-01-01	300565
2012-04-01	314512
2012-07-01	340475
2012-10-01	375129
2013-01-01	378629
2013-04-01	399596
2013-07-01	412952
2013-10-01	442376
2014-01-01	436255
2014-04-01	441940
2014-07-01	433025
2014-10-01	432677
2015-01-01	421270
2015-04-01	425619
2015-07-01	419686
2015-10-01	396700
2016-01-01	404514
2016-04-01	411845
2016-07-01	409478
2016-10-01	409911
2017-01-01	417782
2017-04-01	436292
2017-07-01	450738
2017-10-01	463053
2018-01-01	472623
2018-04-01	450955