Quarter	US dollars
1986-09-30	2193
1986-12-31	2092
1987-03-31	2483
1987-06-30	2988
1987-09-30	3011
1987-12-31	3719
1988-03-31	4020
1988-06-30	4326
1988-09-30	3533
1988-12-31	3646
1989-03-31	4099
1989-06-30	3918
1989-09-30	4134
1989-12-31	3977
1990-03-31	4162
1990-06-30	4689
1990-09-30	5579
1990-12-31	6120
1991-03-31	5335
1991-06-30	5288
1991-09-30	5684
1991-12-31	5348
1992-03-31	5298
1992-06-30	5614
1992-09-30	5687
1992-12-31	5362
1993-03-31	4848
1993-06-30	5157
1993-09-30	5203
1993-12-31	5731
1994-03-31	5270
1994-06-30	4663
1994-09-30	5103
1994-12-31	4689
1995-03-31	4697
1995-06-30	4387
1995-09-30	4367
1995-12-31	4758
1996-03-31	5227
1996-06-30	7196
1996-09-30	8371
1996-12-31	7885
1997-03-31	8844
1997-06-30	8098
1997-09-30	9559
1997-12-31	7846
1998-03-31	8788
1998-06-30	11037
1998-09-30	9116
1998-12-31	8769