Quarter	Millions of US Dollars
1977-01-01	42
1977-04-01	43
1977-07-01	43
1977-10-01	47
1978-01-01	49
1978-04-01	48
1978-07-01	52
1978-10-01	55
1979-01-01	54
1979-04-01	54
1979-07-01	57
1979-10-01	58
1980-01-01	51
1980-04-01	57
1980-07-01	55
1980-10-01	51
1981-01-01	48
1981-04-01	42
1981-07-01	43
1981-10-01	44
1993-07-01	1500
1993-10-01	1500
1994-01-01	1500
1994-04-01	1500
1994-07-01	1500
1994-10-01	1500
1995-01-01	1500
1995-04-01	1500
1995-07-01	1500
1995-10-01	1500
1996-01-01	1500
1996-04-01	1500
1996-07-01	1500
1996-10-01	1500
1997-01-01	1500
1997-04-01	1500
1997-07-01	1500
1997-10-01	1500
1998-01-01	1500
1998-04-01	1500
1998-07-01	1500
1998-10-01	1500
1999-01-01	1500
1999-04-01	1500
1999-07-01	1500
1999-10-01	1500
2000-01-01	1500
2000-04-01	1500
2000-07-01	1500
2000-10-01	1500
2001-01-01	1500
2001-04-01	1500
2001-07-01	1500
2001-10-01	1500
2002-01-01	1500
2002-04-01	1500
2002-07-01	1730
2002-10-01	1730
2003-01-01	1730
2003-04-01	1730
2003-07-01	1730
2003-10-01	1730
2004-01-01	3030
2004-04-01	3030
2004-07-01	3030
2004-10-01	4030
2005-01-01	5105
2005-04-01	7105
2005-07-01	7612
2005-10-01	9965
2006-01-01	15357
2006-04-01	18136
2006-07-01	20093
2006-10-01	31854
2007-01-01	36323
2007-04-01	38167
2007-07-01	42753
2007-10-01	46452
2008-01-01	47199
2008-04-01	52392
2008-07-01	54112
2008-10-01	49825
2009-01-01	47795
2009-04-01	54044
2009-07-01	60066
2009-10-01	55707
2010-01-01	54186
2010-04-01	52556
2010-07-01	53171
2010-10-01	55322
2011-01-01	55676
2011-04-01	57526
2011-07-01	57050
2011-10-01	58640
2012-01-01	60107
2012-04-01	58934
2012-07-01	59989
2012-10-01	65751
2013-01-01	68815
2013-04-01	70997
2013-07-01	70615
2013-10-01	72373
2014-01-01	73735
2014-04-01	80314
2014-07-01	78527
2014-10-01	82627
2015-01-01	85389
2015-04-01	91076
2015-07-01	92763
2015-10-01	93083
2016-01-01	94168
2016-04-01	104654
2016-07-01	108065
2016-10-01	110528
2017-01-01	113252
2017-04-01	117355
2017-07-01	120178
2017-10-01	133379
2018-01-01	136482
2018-04-01	138093