Quarter	US dollars
1986-09-30	26804
1986-12-31	28353
1987-03-31	28537
1987-06-30	28319
1987-09-30	27501
1987-12-31	29352
1988-03-31	27421
1988-06-30	27078
1988-09-30	26070
1988-12-31	27984
1989-03-31	25864
1989-06-30	24828
1989-09-30	24373
1989-12-31	26578
1990-03-31	26334
1990-06-30	27832
1990-09-30	29209
1990-12-31	29817
1991-03-31	26905
1991-06-30	26267
1991-09-30	27785
1991-12-31	27389
1992-03-31	28029
1992-06-30	29001
1992-09-30	29522
1992-12-31	27848
1993-03-31	27915
1993-06-30	28069
1993-09-30	28554
1993-12-31	29025
1994-03-31	28485
1994-06-30	28479
1994-09-30	29470
1994-12-31	29852
1995-03-31	31259
1995-06-30	32207
1995-09-30	33848
1995-12-31	38428
1996-03-31	40270
1996-06-30	43179
1996-09-30	45323
1996-12-31	49989
1997-03-31	50963
1997-06-30	53513
1997-09-30	69875
1997-12-31	68719
1998-03-31	74302
1998-06-30	73098
1998-09-30	77906
1998-12-31	78157