Quarter	Millions of US Dollars
1974-10-01	10
1975-10-01	19
1978-04-01	13
1979-10-01	22
1981-01-01	16
1982-04-01	16
1983-01-01	34
1984-04-01	31
1986-01-01	-15
1987-04-01	-23
1988-04-01	69
1988-07-01	28
1988-10-01	28
1989-01-01	-44
1989-04-01	-41
1989-10-01	-16
1990-04-01	-4
1990-10-01	-39
1991-04-01	-1
1991-10-01	-24
1992-04-01	-1
1993-04-01	-8
1993-07-01	66
1995-10-01	-39
1996-07-01	-119
1997-10-01	-70
2008-04-01	298
2009-04-01	266
2012-04-01	-320
2013-10-01	221
2014-04-01	-337
2017-10-01	205