Quarter	Millions of US Dollars
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	50
1978-10-01	50
1979-01-01	50
1979-04-01	50
1979-07-01	50
1979-10-01	50
1980-01-01	50
1980-04-01	50
1980-07-01	50
1980-10-01	78
1981-01-01	76
1981-04-01	75
1981-07-01	75
1981-10-01	78
1982-01-01	76
1982-04-01	74
1982-07-01	48
1982-10-01	50
1983-01-01	49
1983-04-01	49
1983-07-01	49
1983-10-01	48
1984-01-01	48
1984-04-01	46
1984-07-01	45
1984-10-01	44
1985-01-01	44
1985-04-01	45
1985-07-01	48
1985-10-01	48
1986-01-01	49
1986-04-01	51
1986-07-01	29
1993-04-01	333
1993-07-01	333
1993-10-01	433
1994-01-01	322
1994-04-01	322
1994-07-01	322
1994-10-01	422
1995-01-01	422
1995-04-01	422
1995-07-01	422
1995-10-01	422
1996-01-01	1172
1996-04-01	1672
1996-07-01	2112
1996-10-01	2912
1997-01-01	2912
1997-04-01	2912
1997-07-01	2912
1997-10-01	3562
1998-01-01	3562
1998-04-01	4062
1998-07-01	4062
1998-10-01	4275
1999-01-01	4475
1999-04-01	5175
1999-07-01	5471
1999-10-01	5458
2000-01-01	5448
2000-04-01	5448
2000-07-01	5733
2000-10-01	5743
2001-01-01	5734
2001-04-01	6332
2001-07-01	6701
2001-10-01	6695
2002-01-01	6693
2002-04-01	6718
2002-07-01	7086
2002-10-01	7814
2003-01-01	7751
2003-04-01	8035
2003-07-01	8900
2003-10-01	8878
2004-01-01	9113
2004-04-01	9112
2004-07-01	8860
2004-10-01	9360
2005-01-01	9278
2005-04-01	9428
2005-07-01	9733
2005-10-01	9733
2006-01-01	9076
2006-04-01	9126
2006-07-01	8726
2006-10-01	8926
2007-01-01	8910
2007-04-01	8910
2007-07-01	8901
2007-10-01	8651
2008-01-01	8642
2008-04-01	8616
2008-07-01	8605
2008-10-01	8598
2009-01-01	9188
2009-04-01	8637
2009-07-01	9294
2009-10-01	10347
2010-01-01	10843
2010-04-01	11091
2010-07-01	11787
2010-10-01	13489
2011-01-01	15140
2011-04-01	15372
2011-07-01	15224
2011-10-01	16856
2012-01-01	17176
2012-04-01	17668
2012-07-01	19164
2012-10-01	20023
2013-01-01	20926
2013-04-01	21949
2013-07-01	22993
2013-10-01	26152
2014-01-01	25744
2014-04-01	26444
2014-07-01	30934
2014-10-01	33899
2015-01-01	34807
2015-04-01	37478
2015-07-01	39790
2015-10-01	39459
2016-01-01	39506
2016-04-01	39289
2016-07-01	40340
2016-10-01	40543
2017-01-01	41061
2017-04-01	43229
2017-07-01	49703
2017-10-01	49925
2018-01-01	49952
2018-04-01	51107