Quarter	Millions of US Dollars
1967-04-01	0
1967-07-01	0
1967-10-01	0
1968-01-01	0
1968-04-01	0
1968-07-01	0
1968-10-01	0
1969-01-01	0
1969-04-01	0
1969-07-01	0
1969-10-01	0
1970-01-01	0
1970-04-01	0
1970-07-01	0
1970-10-01	0
1971-01-01	0
1971-04-01	0
1971-07-01	0
1971-10-01	0
1972-01-01	0
1972-04-01	0
1972-07-01	0
1972-10-01	0
1973-01-01	0
1973-04-01	0
1973-07-01	0
1973-10-01	0
1974-01-01	0
1974-04-01	0
1974-07-01	0
1974-10-01	0
1975-01-01	0
1975-04-01	0
1975-07-01	0
1975-10-01	0
1976-01-01	0
1976-04-01	0
1976-07-01	0
1976-10-01	0
1977-01-01	0
1977-04-01	10
1977-07-01	11
1977-10-01	12
1978-01-01	13
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	0
1979-04-01	18
1979-07-01	19
1979-10-01	19
1980-01-01	30
1980-04-01	15
1980-07-01	15
1980-10-01	14
1981-01-01	0
1981-04-01	75
1981-07-01	75
1981-10-01	150
1982-01-01	176
1982-04-01	99
1982-07-01	98
1982-10-01	25
1983-01-01	0
1983-04-01	0
1983-07-01	0
1983-10-01	0
1984-01-01	0
1984-04-01	0
1984-07-01	0
1984-10-01	249
1985-01-01	532
1985-04-01	538
1985-07-01	554
1985-10-01	399
1986-01-01	110
1986-04-01	583
1986-07-01	689
1986-10-01	697
1987-01-01	1475
1987-04-01	1036
1987-07-01	1458
1987-10-01	1852
1988-01-01	1337
1988-04-01	1379
1988-07-01	847
1988-10-01	538
1989-01-01	302
1989-04-01	804
1989-07-01	920
1989-10-01	1078
1990-01-01	1050
1990-04-01	530
1990-07-01	724
1990-10-01	546
1991-01-01	654
1991-04-01	737
1991-07-01	686
1991-10-01	1110
1992-01-01	1171
1992-04-01	2567
1992-07-01	2083
1992-10-01	1645
1993-01-01	1489
1993-04-01	787
1993-07-01	1236
1993-10-01	1250
1994-01-01	1192
1994-04-01	890
1994-07-01	744
1994-10-01	1191
1995-01-01	964
1995-04-01	910
1995-07-01	1483
1995-10-01	1726
1996-01-01	1389
1996-04-01	1714
1996-07-01	809
1996-10-01	542
1997-01-01	1299
1997-04-01	859
1997-07-01	846
1997-10-01	836
1998-01-01	824
1998-04-01	880
1998-07-01	943
1998-10-01	1536
1999-01-01	585
1999-04-01	790
1999-07-01	820
1999-10-01	545
2000-01-01	518
2000-04-01	379
2000-07-01	249
2000-10-01	1186
2001-01-01	1671
2001-04-01	1827
2001-07-01	2657
2001-10-01	1442
2002-01-01	1012
2002-04-01	1486
2002-07-01	723
2002-10-01	866
2003-01-01	770
2003-04-01	114
2003-07-01	262
2003-10-01	1863
2004-01-01	1988
2004-04-01	3271
2004-07-01	3805
2004-10-01	7225
2005-01-01	6850
2005-04-01	5580
2005-07-01	4090
2005-10-01	638
2006-01-01	2168
2006-04-01	2023
2006-07-01	2647
2006-10-01	2436
2007-01-01	999
2007-04-01	2026
2007-07-01	1276
2007-10-01	4108
2008-01-01	4351
2008-04-01	3153
2008-07-01	3988
2008-10-01	1273
2009-01-01	1116
2009-04-01	3031
2009-07-01	1978
2009-10-01	2954
2010-01-01	3774
2010-04-01	5154
2010-07-01	6619
2010-10-01	7816
2011-01-01	8989
2011-04-01	5494
2011-07-01	5300
2011-10-01	4257
2012-01-01	3593
2012-04-01	5930
2012-07-01	5767
2012-10-01	5330
2013-01-01	7542
2013-04-01	11497
2013-07-01	12546
2013-10-01	15506
2014-01-01	12814
2014-04-01	6995
2014-07-01	5500
2014-10-01	6092
2015-01-01	14493
2015-04-01	16138
2015-07-01	16969
2015-10-01	17244
2016-01-01	10966
2016-04-01	12029
2016-07-01	13062
2016-10-01	11138
2017-01-01	12933
2017-04-01	14540
2017-07-01	15682
2017-10-01	13154
2018-01-01	12665
2018-04-01	12133