Quarter	Millions of US Dollars
1976-04-01	24
1976-07-01	24
1976-10-01	24
1977-01-01	24
1977-04-01	24
1977-07-01	24
1977-10-01	25
1978-01-01	25
1978-04-01	25
1978-07-01	26
1978-10-01	26
1979-01-01	25
1979-04-01	25
1979-07-01	25
1979-10-01	26
1980-01-01	25
1980-04-01	26
1980-07-01	26
1980-10-01	26
1981-01-01	26
1981-04-01	25
1981-07-01	25
1981-10-01	25
1982-01-01	24
1982-04-01	24
1982-07-01	24
1982-10-01	24
1983-01-01	24
1983-04-01	24
1983-07-01	24
1983-10-01	24
1984-01-01	24
1984-04-01	24
1984-07-01	23
1984-10-01	23
1985-01-01	23
1985-04-01	51
1985-07-01	56
1985-10-01	96
1986-01-01	105
1986-04-01	150
1986-07-01	159
1986-10-01	216
1987-01-01	594
1987-04-01	563
1987-07-01	534
1987-10-01	742
1988-01-01	1180
1988-04-01	1405
1988-07-01	1425
1988-10-01	1967
1989-01-01	1910
1989-04-01	2086
1989-07-01	2498
1989-10-01	2870
1990-01-01	3006
1990-04-01	3252
1990-07-01	3552
1990-10-01	3803
1991-01-01	3563
1991-04-01	3680
1991-07-01	3849
1991-10-01	4432
1992-01-01	4501
1992-04-01	4881
1992-07-01	6192
1992-10-01	6689
1993-01-01	8077
1993-04-01	8726
1993-07-01	9443
1993-10-01	10539
1994-01-01	11580
1994-04-01	11954
1994-07-01	12108
1994-10-01	12045
1995-01-01	13001
1995-04-01	12858
1995-07-01	12734
1995-10-01	12583
1996-01-01	12681
1996-04-01	13784
1996-07-01	13216
1996-10-01	12170
1997-01-01	12216
1997-04-01	13297
1997-07-01	13541
1997-10-01	13715
1998-01-01	14388
1998-04-01	14993
1998-07-01	15365
1998-10-01	14586
1999-01-01	14966
1999-04-01	14930
1999-07-01	15624
1999-10-01	18185
2000-01-01	19795
2000-04-01	21634
2000-07-01	22378
2000-10-01	22527
2001-01-01	22204
2001-04-01	21233
2001-07-01	21920
2001-10-01	21734
2002-01-01	22469
2002-04-01	23594
2002-07-01	23204
2002-10-01	23807
2003-01-01	24409
2003-04-01	25773
2003-07-01	26454
2003-10-01	26520
2004-01-01	26186
2004-04-01	27053
2004-07-01	27646
2004-10-01	30433
2005-01-01	31835
2005-04-01	33596
2005-07-01	34323
2005-10-01	35949
2006-01-01	38833
2006-04-01	40004
2006-07-01	42581
2006-10-01	44202
2007-01-01	48443
2007-04-01	48864
2007-07-01	48923
2007-10-01	50663
2008-01-01	50408
2008-04-01	50867
2008-07-01	50920
2008-10-01	49740
2009-01-01	50870
2009-04-01	51825
2009-07-01	52282
2009-10-01	51543
2010-01-01	52459
2010-04-01	51792
2010-07-01	55816
2010-10-01	57193
2011-01-01	60947
2011-04-01	61462
2011-07-01	60518
2011-10-01	61269
2012-01-01	64295
2012-04-01	65860
2012-07-01	68273
2012-10-01	74320
2013-01-01	76473
2013-04-01	82658
2013-07-01	84128
2013-10-01	90952
2014-01-01	91743
2014-04-01	98275
2014-07-01	103123
2014-10-01	107152
2015-01-01	107713
2015-04-01	109216
2015-07-01	107658
2015-10-01	106333
2016-01-01	108899
2016-04-01	114898
2016-07-01	112853
2016-10-01	114766
2017-01-01	120550
2017-04-01	130231
2017-07-01	130367
2017-10-01	134443
2018-01-01	137847
2018-04-01	135320