Quarter	Millions of US Dollars
1972-07-01	25
1972-10-01	25
1973-01-01	25
1973-04-01	45
1973-07-01	45
1973-10-01	45
1974-01-01	45
1974-04-01	107
1974-07-01	106
1974-10-01	107
1975-01-01	108
1975-04-01	143
1975-07-01	140
1975-10-01	140
1976-01-01	140
1976-04-01	248
1976-07-01	250
1976-10-01	288
1977-01-01	289
1977-04-01	357
1977-07-01	418
1977-10-01	514
1978-01-01	663
1978-04-01	893
1978-07-01	964
1978-10-01	1270
1979-01-01	1324
1979-04-01	1447
1979-07-01	1494
1979-10-01	1491
1980-01-01	1443
1980-04-01	1497
1980-07-01	1491
1980-10-01	1463
1981-01-01	1434
1981-04-01	1343
1981-07-01	1349
1981-10-01	1372
1982-01-01	1341
1982-04-01	1298
1982-07-01	1256
1982-10-01	1262
1983-01-01	1208
1983-04-01	1167
1983-07-01	1141
1983-10-01	1051
1984-01-01	1055
1984-04-01	1044
1984-07-01	1005
1984-10-01	997
1985-01-01	965
1985-04-01	1430
1985-07-01	1451
1985-10-01	1293
1986-01-01	1303
1986-04-01	1295
1986-07-01	1400
1986-10-01	1363
1987-01-01	1394
1987-04-01	1345
1987-07-01	1299
1987-10-01	1334
1988-01-01	1445
1988-04-01	1468
1988-07-01	1557
1988-10-01	1575
1989-01-01	1487
1989-04-01	1499
1989-07-01	1559
1989-10-01	1597
1990-01-01	1551
1990-04-01	1448
1990-07-01	1492
1990-10-01	1486
1991-01-01	1355
1991-04-01	1336
1991-07-01	1370
1991-10-01	1436
1992-01-01	1376
1992-04-01	1413
1992-07-01	1333
1992-10-01	1214
1993-01-01	1173
1993-04-01	684
1993-07-01	607
1993-10-01	570
1994-01-01	517
1994-04-01	445
1994-07-01	352
1994-10-01	348
1995-01-01	398
1995-04-01	220
1995-07-01	101