Quarter	Millions of US Dollars
1978-01-01	64
1978-04-01	112
1978-07-01	124
1978-10-01	164
1979-01-01	157
1979-04-01	157
1979-07-01	160
1979-10-01	156
1980-01-01	146
1980-04-01	159
1980-07-01	159
1980-10-01	156
1981-01-01	150
1981-04-01	140
1981-07-01	141
1981-10-01	147
1982-01-01	137
1982-04-01	133
1982-07-01	130
1982-10-01	139
1983-01-01	82
1983-04-01	82
1983-07-01	132
1983-10-01	133
1984-01-01	135
1984-04-01	221
1984-07-01	214
1984-10-01	251
1985-01-01	285
1985-04-01	289
1985-07-01	337
1985-10-01	402
1986-01-01	430
1986-04-01	457
1986-07-01	472
1986-10-01	466
1987-01-01	551
1987-04-01	549
1987-07-01	551
1987-10-01	702
1988-01-01	769
1988-04-01	717
1988-07-01	708
1988-10-01	754
1989-01-01	713
1989-04-01	668
1989-07-01	688
1989-10-01	638
1990-01-01	602
1990-04-01	507
1990-07-01	513
1990-10-01	483
1991-01-01	461
1991-04-01	425
1991-07-01	445
1991-10-01	474
1992-01-01	388
1992-04-01	413
1992-07-01	423
1992-10-01	356
1993-01-01	284
1993-04-01	294
1993-07-01	294
1993-10-01	411
1994-01-01	348
1994-04-01	353
1994-07-01	355
1994-10-01	303
1995-01-01	306
1995-04-01	305
1995-07-01	304
1995-10-01	303
1996-01-01	271
1996-04-01	272
1996-07-01	272
1996-10-01	426
1997-01-01	424
1997-04-01	425
1997-07-01	424
1997-10-01	325
1998-01-01	326
1998-04-01	435
1998-07-01	436
1998-10-01	435
1999-01-01	434
1999-04-01	433
1999-07-01	665
1999-10-01	664
2000-01-01	663
2000-04-01	911
2000-07-01	909
2000-10-01	785
2001-01-01	783
2001-04-01	782
2001-07-01	784
2001-10-01	934
2002-01-01	933
2002-04-01	936
2002-07-01	937
2002-10-01	939
2003-01-01	938
2003-04-01	940
2003-07-01	940
2003-10-01	944
2004-01-01	945
2004-04-01	945
2004-07-01	945
2004-10-01	948
2005-01-01	947
2005-04-01	944
2005-07-01	943
2005-10-01	942
2006-01-01	1342
2006-04-01	1345
2006-07-01	1346
2006-10-01	1199
2007-01-01	1199
2007-04-01	2101
2007-07-01	2101
2007-10-01	2101
2008-01-01	2100
2008-04-01	2100
2008-07-01	2095
2008-10-01	2084
2009-01-01	2083
2009-04-01	2040
2009-07-01	2890
2009-10-01	2660
2010-01-01	2660
2010-04-01	2660
2010-07-01	2660
2010-10-01	2660
2011-01-01	2660
2011-04-01	2660
2011-07-01	2660
2011-10-01	2660
2012-01-01	2660
2012-04-01	2660
2012-07-01	2660
2012-10-01	2660
2013-01-01	2660
2013-04-01	2550
2013-07-01	2550
2013-10-01	3100
2014-01-01	2950
2014-04-01	2950
2014-07-01	2950
2014-10-01	2950
2015-01-01	2950
2015-04-01	2950
2015-07-01	2950
2015-10-01	2950
2016-01-01	2950
2016-04-01	2950
2016-07-01	3950
2016-10-01	4550
2017-01-01	4550
2017-04-01	4550
2017-07-01	4550
2017-10-01	4550
2018-01-01	4550
2018-04-01	4550