Quarter	Millions of US Dollars
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	0
1977-07-01	0
1977-10-01	0
1978-01-01	0
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	0
1979-04-01	0
1979-07-01	11
1979-10-01	11
1980-01-01	9
1980-04-01	10
1980-07-01	0
1980-10-01	60
1981-01-01	67
1981-04-01	65
1981-07-01	66
1981-10-01	27
1982-01-01	39
1982-04-01	138
1982-07-01	137
1982-10-01	254
1983-01-01	380
1983-04-01	274
1983-07-01	296
1983-10-01	205
1984-01-01	64
1984-04-01	95
1984-07-01	66
1984-10-01	345
1985-01-01	497
1985-04-01	560
1985-07-01	793
1985-10-01	810
1986-01-01	675
1986-04-01	805
1986-07-01	860
1986-10-01	466
1987-01-01	593
1987-04-01	446
1987-07-01	524
1987-10-01	652
1988-01-01	679
1988-04-01	993
1988-07-01	637
1988-10-01	636
1989-01-01	473
1989-04-01	269
1989-07-01	270
1989-10-01	359
1990-01-01	602
1990-04-01	553
1990-07-01	585
1990-10-01	586
1991-01-01	508
1991-04-01	296
1991-07-01	322
1991-10-01	366
1992-01-01	149
1992-04-01	737
1992-07-01	684
1992-10-01	899
1993-01-01	966
1993-04-01	768
1993-07-01	751
1993-10-01	806
1994-01-01	759
1994-04-01	759
1994-07-01	786
1994-10-01	1160
1995-01-01	2037
1995-04-01	2612
1995-07-01	2569
1995-10-01	1839
1996-01-01	1940
1996-04-01	2869
1996-07-01	3518
1996-10-01	7038
1997-01-01	7552
1997-04-01	7263
1997-07-01	6354
1997-10-01	3724
1998-01-01	3206
1998-04-01	3557
1998-07-01	3499
1998-10-01	1409
1999-01-01	2297
1999-04-01	2378
1999-07-01	3328
1999-10-01	4531
2000-01-01	3988
2000-04-01	4063
2000-07-01	3367
2000-10-01	2450
2001-01-01	1753
2001-04-01	2711
2001-07-01	3062
2001-10-01	2613
2002-01-01	2233
2002-04-01	3235
2002-07-01	3197
2002-10-01	4510
2003-01-01	4405
2003-04-01	3355
2003-07-01	4501
2003-10-01	3139
2004-01-01	2942
2004-04-01	2904
2004-07-01	1124
2004-10-01	1234
2005-01-01	2156
2005-04-01	1046
2005-07-01	8873
2005-10-01	8761
2006-01-01	10337
2006-04-01	11409
2006-07-01	9460
2006-10-01	10133
2007-01-01	7782
2007-04-01	7358
2007-07-01	7726
2007-10-01	7900
2008-01-01	8468
2008-04-01	13117
2008-07-01	4889
2008-10-01	4463
2009-01-01	4692
2009-04-01	415
2009-07-01	403
2009-10-01	406
2010-01-01	0
2010-04-01	3000
2010-07-01	3200
2010-10-01	3200
2011-01-01	3563
2011-04-01	571
2011-07-01	1342
2011-10-01	1334
2012-01-01	1000
2012-04-01	2000
2012-07-01	1000
2012-10-01	1000
2013-01-01	1320
2013-04-01	327
2013-07-01	338
2013-10-01	445
2014-01-01	1099
2014-04-01	1122
2014-07-01	1304
2014-10-01	5034
2015-01-01	9619
2015-04-01	9779
2015-07-01	9532
2015-10-01	5598
2016-01-01	1929
2016-04-01	2665
2016-07-01	2792
2016-10-01	2979
2017-01-01	1905
2017-04-01	4095
2017-07-01	3962
2017-10-01	6904
2018-01-01	7776
2018-04-01	8516