Quarter	Millions of US Dollars
1978-07-01	62
1978-10-01	62
1979-01-01	61
1979-04-01	61
1979-07-01	61
1979-10-01	62
1980-01-01	61
1980-04-01	62
1980-07-01	62
1980-10-01	62
1981-01-01	61
1981-04-01	61
1981-07-01	60
1981-10-01	61
1982-01-01	60
1982-04-01	60
1982-07-01	59
1982-10-01	60
1983-01-01	59
1983-04-01	59
1983-07-01	34
1983-10-01	34
1984-01-01	34
1984-04-01	34
1984-07-01	123
1984-10-01	123
1985-01-01	123
1985-04-01	123
1985-07-01	124
1985-10-01	125
1986-01-01	124
1986-04-01	124
1986-07-01	90
1986-10-01	90
1987-01-01	127
1987-04-01	120
1987-07-01	85
1987-10-01	50
1988-01-01	50
1988-04-01	50
1988-07-01	50
1988-10-01	50
1989-01-01	50
1989-04-01	50
1989-07-01	50
1989-10-01	78
1990-01-01	50
1990-04-01	50
1990-07-01	50
1990-10-01	50
1991-01-01	50
1991-04-01	50
1991-07-01	50
1991-10-01	50
1992-01-01	50
1992-04-01	50
2002-01-01	450
2002-04-01	450
2002-07-01	750
2002-10-01	750
2003-01-01	750
2003-04-01	750
2003-07-01	750
2003-10-01	950
2004-01-01	950
2004-04-01	950
2004-07-01	950
2004-10-01	1450
2005-01-01	1000
2005-04-01	1500
2005-07-01	2189
2005-10-01	2243
2006-01-01	2790
2006-04-01	3110
2006-07-01	2554
2006-10-01	3167
2007-01-01	3169
2007-04-01	3595
2007-07-01	3726
2007-10-01	3656
2008-01-01	4097
2008-04-01	4047
2008-07-01	3925
2008-10-01	3316
2009-01-01	3251
2009-04-01	3294
2009-07-01	3319
2009-10-01	3313
2010-01-01	3290
2010-04-01	2744
2010-07-01	3814
2010-10-01	3805
2011-01-01	4022
2011-04-01	3105
2011-07-01	3311
2011-10-01	3566
2012-01-01	3592
2012-04-01	3656
2012-07-01	2881
2012-10-01	3653
2013-01-01	3435
2013-04-01	3425
2013-07-01	3350
2013-10-01	3354
2014-01-01	3859
2014-04-01	4867
2014-07-01	5545
2014-10-01	5496
2015-01-01	5549
2015-04-01	6467
2015-07-01	6424
2015-10-01	5729
2016-01-01	6616
2016-04-01	7176
2016-07-01	7471
2016-10-01	10681
2017-01-01	16928
2017-04-01	19662
2017-07-01	19705
2017-10-01	19459
2018-01-01	19588
2018-04-01	19728