Quarter	Millions of US Dollars
1976-04-01	58
1976-07-01	58
1976-10-01	96
1977-01-01	97
1977-04-01	97
1977-07-01	128
1977-10-01	177
1978-01-01	224
1978-04-01	413
1978-07-01	472
1978-10-01	561
1979-01-01	606
1979-04-01	608
1979-07-01	639
1979-10-01	641
1980-01-01	629
1980-04-01	643
1980-07-01	641
1980-10-01	632
1981-01-01	624
1981-04-01	612
1981-07-01	613
1981-10-01	618
1982-01-01	610
1982-04-01	606
1982-07-01	603
1982-10-01	608
1983-01-01	605
1983-04-01	602
1983-07-01	577
1983-10-01	538
1984-01-01	538
1984-04-01	537
1984-07-01	535
1984-10-01	533
1985-01-01	533
1985-04-01	533
1985-07-01	536
1985-10-01	471
1986-01-01	470
1986-04-01	455
1986-07-01	451
1986-10-01	410
1987-01-01	415
1987-04-01	412
1987-07-01	367
1987-10-01	370
1988-01-01	341
1988-04-01	319
1988-07-01	279
1988-10-01	280
1989-01-01	261
1989-04-01	259
1989-07-01	242
1989-10-01	243
1990-01-01	225
1990-04-01	189
1990-07-01	172
1990-10-01	138
1991-01-01	85
1991-04-01	85
1991-07-01	68
1991-10-01	68
1992-01-01	68
1992-04-01	50
1992-07-01	50