Quarter	Millions of US Dollars
1972-01-01	35
1972-04-01	35
1972-07-01	53
1972-10-01	53
1973-01-01	85
1973-04-01	129
1973-07-01	138
1973-10-01	126
1974-01-01	146
1974-04-01	146
1974-07-01	144
1974-10-01	192
1975-01-01	269
1975-04-01	356
1975-07-01	499
1975-10-01	838
1976-01-01	1122
1976-04-01	1337
1976-07-01	1500
1976-10-01	1665
1977-01-01	2222
1977-04-01	2610
1977-07-01	2770
1977-10-01	3374
1978-01-01	4065
1978-04-01	4554
1978-07-01	4862
1978-10-01	5360
1979-01-01	5618
1979-04-01	5924
1979-07-01	6250
1979-10-01	6232
1980-01-01	5991
1980-04-01	6443
1980-07-01	6301
1980-10-01	5699
1981-01-01	5218
1981-04-01	4689
1981-07-01	4705
1981-10-01	4854
1982-01-01	4099
1982-04-01	3656
1982-07-01	3537
1982-10-01	3436
1983-01-01	2925
1983-04-01	2425
1983-07-01	2405
1983-10-01	2045
1984-01-01	1988
1984-04-01	1665
1984-07-01	1498
1984-10-01	1415
1985-01-01	1304
1985-04-01	1299
1985-07-01	1438
1985-10-01	1323
1986-01-01	1421
1986-04-01	1493
1986-07-01	2094
1986-10-01	2550
1987-01-01	2771
1987-04-01	3511
1987-07-01	3339
1987-10-01	3552
1988-01-01	3940
1988-04-01	4078
1988-07-01	3944
1988-10-01	4115
1989-01-01	4276
1989-04-01	4108
1989-07-01	4188
1989-10-01	4183
1990-01-01	4056
1990-04-01	4040
1990-07-01	4265
1990-10-01	4216
1991-01-01	3834
1991-04-01	3780
1991-07-01	4643
1991-10-01	5405
1992-01-01	6502
1992-04-01	8125
1992-07-01	8291
1992-10-01	7940
1993-01-01	8135
1993-04-01	9972
1993-07-01	9963
1993-10-01	9564
1994-01-01	9434
1994-04-01	9570
1994-07-01	9734
1994-10-01	9610
1995-01-01	10289
1995-04-01	9791
1995-07-01	9314
1995-10-01	9192
1996-01-01	8993
1996-04-01	8848
1996-07-01	7560
1996-10-01	6438
1997-01-01	4221
1997-04-01	3003
1997-07-01	2984
1997-10-01	2922
1998-01-01	2412
1998-04-01	1089
1998-07-01	1060
1998-10-01	724
1999-01-01	697
1999-04-01	708
1999-07-01	711
1999-10-01	716
2000-01-01	716
2000-04-01	706
2000-07-01	698
2000-10-01	700
2001-01-01	676
2001-04-01	692
2001-07-01	675
2001-10-01	670
2002-01-01	670
2002-04-01	699
2002-07-01	675
2002-10-01	475