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
2007-07-01	1000
2007-10-01	1000
2008-01-01	1000
2008-04-01	2770
2008-07-01	2770
2008-10-01	2770
2009-01-01	2770
2009-04-01	8770
2009-07-01	8770
2009-10-01	8770
2010-01-01	8770
2010-04-01	8770
2010-07-01	8770
2010-10-01	10204
2011-01-01	10201
2011-04-01	10706
2011-07-01	10715
2011-10-01	10714
2012-01-01	10703
2012-04-01	10709
2012-07-01	9713
2012-10-01	9694
2013-01-01	9679
2013-04-01	7902
2013-07-01	7904
2013-10-01	7893
2014-01-01	7895
2014-04-01	4856
2014-07-01	4848
2014-10-01	4833
2015-01-01	5747
2015-04-01	5742
2015-07-01	5743
2015-10-01	5243
2016-01-01	5732
2016-04-01	15152
2016-07-01	15288
2016-10-01	15304
2017-01-01	15374
2017-04-01	15394
2017-07-01	15397
2017-10-01	25445
2018-01-01	26058
2018-04-01	26022