Quarter	Millions of US Dollars
1973-07-01	26
1973-10-01	25
1974-01-01	27
1974-04-01	27
1974-07-01	27
1974-10-01	32
1975-01-01	56
1975-04-01	56
1975-07-01	53
1975-10-01	54
1976-01-01	56
1976-04-01	57
1976-07-01	57
1976-10-01	58
1977-01-01	57
1977-04-01	101
1977-07-01	124
1977-10-01	131
1978-01-01	134
1978-04-01	133
1978-07-01	88
1978-10-01	87
1979-01-01	84
1979-04-01	82
1979-07-01	84
1979-10-01	85
1980-01-01	82
1980-04-01	85
1980-07-01	84
1980-10-01	82
1981-01-01	79
1981-04-01	76
1981-07-01	68
1981-10-01	104
1982-01-01	102
1982-04-01	101
1982-07-01	120
1982-10-01	118
1983-01-01	116
1983-04-01	112
1983-07-01	105
1983-10-01	108
1984-01-01	108
1984-04-01	107
1984-07-01	94
1984-10-01	169
1985-01-01	153
1985-04-01	127
1985-07-01	128
1985-10-01	173
1986-01-01	175
1986-04-01	177
1986-07-01	253
1986-10-01	310
1987-01-01	314
1987-04-01	378
1987-07-01	378
1987-10-01	390
1988-01-01	548
1988-04-01	537
1988-07-01	510
1988-10-01	527
1989-01-01	514
1989-04-01	656
1989-07-01	737
1989-10-01	736
1990-01-01	842
1990-04-01	998
1990-07-01	1047
1990-10-01	1057
1991-01-01	972
1991-04-01	1131
1991-07-01	1103
1991-10-01	1051
1992-01-01	905
1992-04-01	928
1992-07-01	922
1992-10-01	954
1993-01-01	1023
1993-04-01	1066
1993-07-01	1501
1993-10-01	2291
1994-01-01	2818
1994-04-01	3171
1994-07-01	3612
1994-10-01	3798
1995-01-01	3628
1995-04-01	3357
1995-07-01	3318
1995-10-01	3595
1996-01-01	3654
1996-04-01	3933
1996-07-01	4041
1996-10-01	4020
1997-01-01	4350
1997-04-01	4390
1997-07-01	5160
1997-10-01	4933
1998-01-01	4841
1998-04-01	4736
1998-07-01	4864
1998-10-01	5220
1999-01-01	6122
1999-04-01	5961
1999-07-01	6816
1999-10-01	7378
2000-01-01	8033
2000-04-01	7946
2000-07-01	7999
2000-10-01	8626
2001-01-01	8094
2001-04-01	10400
2001-07-01	10407
2001-10-01	11077
2002-01-01	13000
2002-04-01	14105
2002-07-01	13726
2002-10-01	13745
2003-01-01	13696
2003-04-01	13906
2003-07-01	14564
2003-10-01	14466
2004-01-01	14987
2004-04-01	14954
2004-07-01	14408
2004-10-01	13662
2005-01-01	13746
2005-04-01	13732
2005-07-01	13704
2005-10-01	13234
2006-01-01	13375
2006-04-01	13121
2006-07-01	12950
2006-10-01	13486
2007-01-01	13620
2007-04-01	13663
2007-07-01	13652
2007-10-01	13643
2008-01-01	13715
2008-04-01	13651
2008-07-01	13527
2008-10-01	14798
2009-01-01	12498
2009-04-01	14618
2009-07-01	13733
2009-10-01	13899
2010-01-01	13486
2010-04-01	13774
2010-07-01	14043
2010-10-01	13838
2011-01-01	11636
2011-04-01	14490
2011-07-01	15034
2011-10-01	14640
2012-01-01	15491
2012-04-01	16911
2012-07-01	17060
2012-10-01	19826
2013-01-01	22345
2013-04-01	26096
2013-07-01	25811
2013-10-01	27111
2014-01-01	26990
2014-04-01	29473
2014-07-01	32424
2014-10-01	33162
2015-01-01	33290
2015-04-01	34465
2015-07-01	34791
2015-10-01	34330
2016-01-01	35129
2016-04-01	34994
2016-07-01	35560
2016-10-01	37720
2017-01-01	41283
2017-04-01	41802
2017-07-01	41989
2017-10-01	43376
2018-01-01	42908
2018-04-01	44912