Quarter	Millions of US Dollars
1976-10-01	35
1977-01-01	63
1977-04-01	63
1977-07-01	63
1977-10-01	64
1978-01-01	65
1978-04-01	65
1978-07-01	67
1978-10-01	67
1979-01-01	66
1979-04-01	66
1979-07-01	66
1979-10-01	66
1980-01-01	66
1980-04-01	68
1980-07-01	68
1980-10-01	67
1981-01-01	66
1981-04-01	65
1981-07-01	65
1981-10-01	65
1982-01-01	64
1982-04-01	64
1982-07-01	63
1982-10-01	64
1983-01-01	63
1983-04-01	63
1983-07-01	63
1983-10-01	63
1984-01-01	63
1984-04-01	63
1984-07-01	62
1984-10-01	61
1985-01-01	61
1985-04-01	60
1985-07-01	61
1985-10-01	62
1986-01-01	62
1986-04-01	61
1986-07-01	61
1986-10-01	27
2014-04-01	1550
2014-07-01	1623
2014-10-01	1620
2015-01-01	1614
2015-04-01	2615
2015-07-01	2769
2015-10-01	2766
2016-01-01	2706
2016-04-01	2703
2016-07-01	2704
2016-10-01	2699
2017-01-01	2700
2017-04-01	2706
2017-07-01	2709
2017-10-01	2711
2018-01-01	2713
2018-04-01	2713