Quarter	Millions of US Dollars
1977-01-01	15
1982-01-01	-15
1994-01-01	10
1995-01-01	-10
1995-04-01	5
1995-10-01	-5
1996-01-01	3
1996-04-01	-3
2011-07-01	150
2012-10-01	500
2013-07-01	1000
2017-01-01	2000