Quarter	Millions of US Dollars
1973-10-01	25
1974-01-01	25
1974-04-01	25
1974-07-01	25
1974-10-01	25
1975-01-01	25
1975-04-01	25
1975-07-01	25
1975-10-01	25
1976-01-01	25
1976-04-01	25
1976-07-01	25
1976-10-01	25
1977-01-01	25
1977-04-01	25
1977-07-01	25
1977-10-01	25
1978-01-01	25
1978-04-01	25
1978-07-01	25
1978-10-01	25
1979-01-01	25
1979-04-01	25
1979-07-01	25
1987-01-01	100
1987-04-01	100
1987-07-01	100
1987-10-01	100
1988-01-01	189
1988-04-01	193
1988-07-01	113
1988-10-01	187
1989-01-01	218
1989-04-01	163
1989-07-01	170
1989-10-01	156
1990-01-01	83
1990-04-01	92
1990-07-01	21
1991-01-01	5
1991-04-01	65
1991-07-01	106
1991-10-01	135
1992-01-01	130
1992-04-01	125
1992-07-01	140
1992-10-01	131
1993-01-01	132
1993-04-01	132
1993-07-01	152
1993-10-01	164
1994-01-01	223
1994-04-01	188
1994-07-01	240
1994-10-01	234
1995-01-01	229
1995-04-01	245
1995-07-01	245
1995-10-01	245
1996-01-01	245
1996-04-01	245
1996-07-01	245
1996-10-01	250
1997-01-01	475
1997-04-01	440
1997-07-01	440
1997-10-01	362
1998-01-01	418
1998-04-01	470
1998-07-01	475
1998-10-01	296
1999-01-01	284
1999-04-01	494
1999-07-01	470
1999-10-01	372
2000-01-01	395
2000-04-01	366
2000-07-01	360
2000-10-01	354
2001-01-01	390
2001-04-01	324
2001-07-01	225
2001-10-01	225
2004-04-01	250
2004-07-01	250
2004-10-01	250
2005-01-01	250
2005-04-01	250
2005-07-01	250
2005-10-01	250
2006-01-01	250
2006-04-01	250
2006-07-01	250
2006-10-01	1200
2007-01-01	1200
2007-04-01	1215
2007-07-01	1215
2007-10-01	1215
2008-01-01	1215
2008-04-01	1215
2008-07-01	1215
2008-10-01	1215
2009-01-01	1215
2009-04-01	965
2009-07-01	965
2009-10-01	965
2010-01-01	965
2010-04-01	965
2010-07-01	965
2010-10-01	965
2011-01-01	965
2011-04-01	965
2011-07-01	965
2011-10-01	940
2012-01-01	966
2012-04-01	951
2012-07-01	951
2012-10-01	977
2013-01-01	1451
2013-04-01	1451
2013-07-01	1451
2013-10-01	1451
2014-01-01	1451
2014-04-01	1451
2014-07-01	1451
2014-10-01	1951
2015-01-01	1951
2015-04-01	3251
2015-07-01	3251
2015-10-01	4175
2016-01-01	4175
2016-04-01	8752
2016-07-01	9365
2016-10-01	11865
2017-01-01	18865
2017-04-01	20865
2017-07-01	20866
2017-10-01	21365
2018-01-01	27152
2018-04-01	27239