Quarter	Millions of US Dollars
1972-07-01	25
1973-04-01	20
1974-04-01	61
1975-04-01	35
1976-04-01	109
1976-10-01	38
1977-04-01	68
1977-07-01	60
1977-10-01	88
1978-01-01	140
1978-04-01	233
1978-07-01	51
1978-10-01	292
1979-01-01	74
1979-04-01	119
1979-07-01	25
1981-04-01	-50
1982-04-01	-25
1982-07-01	-30
1982-10-01	-21
1983-01-01	-42
1983-04-01	-34
1983-07-01	-23
1983-10-01	-84
1984-07-01	-25
1985-01-01	-31
1985-04-01	465
1985-10-01	-169
1986-04-01	-14
1986-07-01	86
1986-10-01	-41
1987-04-01	-40
1987-07-01	-46
1987-10-01	-21
1988-01-01	124
1988-04-01	76
1988-07-01	107
1988-10-01	-32
1989-01-01	-42
1989-04-01	53
1989-07-01	34
1990-01-01	-18
1990-04-01	-120
1990-07-01	-18
1991-01-01	-52
1991-07-01	-18
1992-04-01	-18
1992-07-01	-137
1992-10-01	-50
1993-01-01	-66
1993-04-01	-500
1993-07-01	-89
1994-01-01	-87
1994-04-01	-90
1994-07-01	-96
1995-04-01	-189
1995-07-01	-92
1995-10-01	-99