Quarter	Millions of US Dollars
1975-04-01	12
1975-07-01	12
1975-10-01	31
1976-01-01	32
1976-04-01	56
1976-07-01	58
1976-10-01	70
1977-01-01	70
1977-04-01	70
1977-07-01	101
1977-10-01	105
1978-01-01	107
1978-04-01	107
1978-07-01	112
1978-10-01	113
1979-01-01	111
1979-04-01	112
1979-07-01	115
1979-10-01	115
1980-01-01	109
1980-04-01	114
1980-07-01	113
1980-10-01	109
1981-01-01	181
1981-04-01	177
1981-07-01	178
1981-10-01	181
1982-01-01	178
1982-04-01	214
1982-07-01	197
1982-10-01	177
1983-01-01	177
1983-04-01	152
1983-07-01	152
1983-10-01	140
1984-01-01	140
1984-04-01	140
1984-07-01	125
1984-10-01	125
1985-01-01	125
1985-04-01	125
1985-07-01	125
1985-10-01	200
1986-01-01	125
1986-04-01	125
1986-07-01	125
1986-10-01	125
1987-01-01	125
1987-04-01	200
1987-07-01	200
1987-10-01	275
1988-01-01	275
1988-04-01	275
1988-07-01	275
1988-10-01	275
1989-01-01	275
1989-04-01	275
1989-07-01	275
1989-10-01	275
1990-01-01	350
1990-04-01	350
1990-07-01	350
1990-10-01	350
1991-01-01	350
1991-04-01	370
1991-07-01	480
1991-10-01	480
1992-01-01	519
1992-04-01	469
1992-07-01	469
1992-10-01	394
1993-01-01	394
1993-04-01	394
1993-07-01	544
1993-10-01	484
1994-01-01	574
1994-04-01	626
1994-07-01	677
1994-10-01	727
1995-01-01	657
1995-04-01	659
1995-07-01	653
1995-10-01	502
1996-01-01	481
1996-04-01	730
1996-07-01	500
1996-10-01	741
1997-01-01	820
1997-04-01	965
1997-07-01	1559
1997-10-01	1583
1998-01-01	1548
1998-04-01	2041
1998-07-01	2113
1998-10-01	2138
1999-01-01	2182
1999-04-01	2624
1999-07-01	2633
1999-10-01	2588
2000-01-01	2628
2000-04-01	3515
2000-07-01	3860
2000-10-01	3938
2001-01-01	3640
2001-04-01	3362
2001-07-01	3368
2001-10-01	7098
2002-01-01	6994
2002-04-01	7075
2002-07-01	6399
2002-10-01	6424
2003-01-01	6634
2003-04-01	6695
2003-07-01	7113
2003-10-01	9864
2004-01-01	9957
2004-04-01	10365
2004-07-01	10364
2004-10-01	11377
2005-01-01	11434
2005-04-01	11463
2005-07-01	11634
2005-10-01	11422
2006-01-01	11450
2006-04-01	13168
2006-07-01	13267
2006-10-01	13707
2007-01-01	14191
2007-04-01	15431
2007-07-01	15651
2007-10-01	16820
2008-01-01	17620
2008-04-01	17671
2008-07-01	17821
2008-10-01	16973
2009-01-01	16563
2009-04-01	17379
2009-07-01	19142
2009-10-01	19290
2010-01-01	19535
2010-04-01	20424
2010-07-01	21113
2010-10-01	21496
2011-01-01	22246
2011-04-01	22128
2011-07-01	21827
2011-10-01	19973
2012-01-01	21606
2012-04-01	20901
2012-07-01	22545
2012-10-01	22883
2013-01-01	23974
2013-04-01	23331
2013-07-01	23669
2013-10-01	22920
2014-01-01	23867
2014-04-01	24599
2014-07-01	25075
2014-10-01	24533
2015-01-01	24677
2015-04-01	27038
2015-07-01	26104
2015-10-01	26246
2016-01-01	26038
2016-04-01	26020
2016-07-01	25749
2016-10-01	24901
2017-01-01	25234
2017-04-01	25265
2017-07-01	29154
2017-10-01	29856
2018-01-01	29558
2018-04-01	30792