Quarter	Millions of US Dollars
1973-10-01	24
1974-01-01	24
1974-04-01	24
1974-07-01	24
1974-10-01	24
1975-01-01	25
1975-04-01	24
1975-07-01	24
1975-10-01	24
1976-01-01	24
1976-04-01	24
1976-07-01	24
1976-10-01	24
1977-01-01	24
1977-04-01	24
1977-07-01	24
1977-10-01	25
1978-01-01	25
1978-04-01	25
1978-07-01	26
1978-10-01	26
1979-01-01	25
1979-04-01	25
1979-07-01	25
1979-10-01	26
1980-01-01	25
1980-04-01	26
1980-07-01	26
1980-10-01	26
1981-01-01	26
1981-04-01	25
1981-07-01	25
1981-10-01	25
1982-01-01	24
1982-04-01	24
1982-07-01	24
1982-10-01	24
1983-01-01	24
1983-04-01	24
1983-07-01	24
1983-10-01	24
1984-01-01	24
1984-04-01	24
1984-07-01	23