Quarter	Millions of US Dollars
1975-04-01	15
1975-07-01	15
1975-10-01	15
1976-01-01	15
1976-04-01	15
1976-07-01	15
1976-10-01	15
1977-01-01	15
1977-04-01	15
1977-07-01	15
1977-10-01	15
1978-01-01	15
1978-04-01	15
1978-07-01	15
1978-10-01	15
1979-01-01	15
1979-04-01	15
1979-07-01	15
1979-10-01	15
1980-01-01	15
1982-04-01	31
1982-07-01	30
1982-10-01	33
1983-01-01	31
1983-04-01	31
1983-07-01	31
1983-10-01	30
1984-01-01	30
1984-04-01	28
1984-07-01	26
1984-10-01	25
1985-01-01	25
1985-04-01	25
1985-07-01	30
1985-10-01	31
1986-01-01	34
1986-04-01	36
1986-07-01	39
1986-10-01	40
1987-01-01	43
1987-04-01	43
1987-07-01	42
1987-10-01	51
1988-01-01	48
1988-04-01	43
1988-07-01	41
1988-10-01	43
1989-01-01	39
2007-10-01	1000
2008-01-01	1000
2008-04-01	1000
2008-07-01	1000
2008-10-01	1000
2009-01-01	1000
2009-04-01	1000
2009-07-01	1000
2009-10-01	1000
2010-01-01	1000
2010-04-01	1000
2010-07-01	1000
2010-10-01	1000
2011-01-01	1000
2011-04-01	1000
2011-07-01	1000
2011-10-01	1000
2012-01-01	1000
2012-04-01	1000
2012-07-01	1000
2012-10-01	1000
2013-01-01	1000
2013-04-01	1000
2013-07-01	1000
2013-10-01	3109
2014-01-01	3109
2014-04-01	3109
2014-07-01	3109
2014-10-01	3109
2015-01-01	3109
2015-04-01	3609
2015-07-01	3609
2015-10-01	3609
2016-01-01	3609
2016-04-01	3609
2016-07-01	3609
2016-10-01	3609
2017-01-01	3609
2017-04-01	3609
2017-07-01	3809
2017-10-01	2809
2018-01-01	2809
2018-04-01	2809