Quarter	Millions of US Dollars
1972-04-01	25
1972-07-01	25
1972-10-01	25
1973-01-01	28
1973-04-01	52
1973-07-01	53
1973-10-01	47
1974-01-01	50
1974-04-01	50
1974-07-01	49
1974-10-01	53
1975-01-01	55
1975-04-01	54
1975-07-01	48
1975-10-01	49
1976-01-01	50
1976-04-01	53
1976-07-01	63
1976-10-01	65
1977-01-01	64
1977-04-01	65
1977-07-01	109
1977-10-01	118
1978-01-01	123
1978-04-01	193
1978-07-01	207
1978-10-01	262
1979-01-01	352
1979-04-01	349
1979-07-01	407
1979-10-01	397
1980-01-01	364
1980-04-01	380
1980-07-01	380
1980-10-01	371
1981-01-01	353
1981-04-01	323
1981-07-01	324
1981-10-01	343
1982-01-01	626
1982-04-01	652
1982-07-01	640
1982-10-01	975
1983-01-01	1029
1983-04-01	1235
1983-07-01	2082
1983-10-01	2184
1984-01-01	2523
1984-04-01	2484
1984-07-01	2600
1984-10-01	3174
1985-01-01	3180
1985-04-01	4039
1985-07-01	4204
1985-10-01	5363
1986-01-01	5506
1986-04-01	5646
1986-07-01	5768
1986-10-01	5827
1987-01-01	6012
1987-04-01	6074
1987-07-01	6156
1987-10-01	6582
1988-01-01	6719
1988-04-01	6155
1988-07-01	6150
1988-10-01	6323
1989-01-01	6272
1989-04-01	5868
1989-07-01	5855
1989-10-01	6082
1990-01-01	5993
1990-04-01	6064
1990-07-01	6478
1990-10-01	6410
1991-01-01	6177
1991-04-01	6306
1991-07-01	6461
1991-10-01	6654
1992-01-01	6349
1992-04-01	6464
1992-07-01	6636
1992-10-01	5331
1993-01-01	5416
1993-04-01	5499
1993-07-01	4826
1993-10-01	4864
1994-01-01	5218
1994-04-01	5402
1994-07-01	5219
1994-10-01	5355
1995-01-01	5615
1995-04-01	5157
1995-07-01	6525
1995-10-01	6824
1996-01-01	7134
1996-04-01	7290
1996-07-01	7415
1996-10-01	9346
1997-01-01	9334
1997-04-01	11261
1997-07-01	11700
1997-10-01	11921
1998-01-01	11384
1998-04-01	11324
1998-07-01	11205
1998-10-01	11490
1999-01-01	11786
1999-04-01	12646
1999-07-01	13577
1999-10-01	13540
2000-01-01	13539
2000-04-01	13653
2000-07-01	13890
2000-10-01	14864
2001-01-01	14650
2001-04-01	15287
2001-07-01	16336
2001-10-01	16062
2002-01-01	17212
2002-04-01	20285
2002-07-01	20638
2002-10-01	21897
2003-01-01	21869
2003-04-01	21987
2003-07-01	21297
2003-10-01	20917
2004-01-01	20903
2004-04-01	20822
2004-07-01	22344
2004-10-01	23018
2005-01-01	23094
2005-04-01	23761
2005-07-01	24178
2005-10-01	23563
2006-01-01	24688
2006-04-01	24547
2006-07-01	24747
2006-10-01	24965
2007-01-01	24802
2007-04-01	23743
2007-07-01	23691
2007-10-01	23906
2008-01-01	25027
2008-04-01	25002
2008-07-01	25294
2008-10-01	24687
2009-01-01	24014
2009-04-01	21261
2009-07-01	24479
2009-10-01	23643
2010-01-01	23998
2010-04-01	25449
2010-07-01	26735
2010-10-01	26520
2011-01-01	26747
2011-04-01	26939
2011-07-01	27049
2011-10-01	26965
2012-01-01	28082
2012-04-01	30914
2012-07-01	32083
2012-10-01	32591
2013-01-01	32442
2013-04-01	35612
2013-07-01	35783
2013-10-01	36477
2014-01-01	37000
2014-04-01	37641
2014-07-01	36581
2014-10-01	38486
2015-01-01	42665
2015-04-01	43720
2015-07-01	42563
2015-10-01	43069
2016-01-01	43886
2016-04-01	46150
2016-07-01	44828
2016-10-01	46856
2017-01-01	47399
2017-04-01	46940
2017-07-01	47015
2017-10-01	48099
2018-01-01	47701
2018-04-01	46553