Quarter	US dollars
1986-09-30	18416
1986-12-31	19208
1987-03-31	19302
1987-06-30	19836
1987-09-30	20769
1987-12-31	21822
1988-03-31	22317
1988-06-30	21871
1988-09-30	21969
1988-12-31	23090
1989-03-31	22956
1989-06-30	23449
1989-09-30	23936
1989-12-31	24748
1990-03-31	23838
1990-06-30	22712
1990-09-30	22103
1990-12-31	17009
1991-03-31	15008
1991-06-30	13950
1991-09-30	13820
1991-12-31	13683
1992-03-31	12532
1992-06-30	12757
1992-09-30	12724
1992-12-31	11332
1993-03-31	11046
1993-06-30	10379
1993-09-30	10182
1993-12-31	9784
1994-03-31	9338
1994-06-30	8901
1994-09-30	8860
1994-12-31	8320
1995-03-31	8666
1995-06-30	8649
1995-09-30	9338
1995-12-31	10483
1996-03-31	11019
1996-06-30	11539
1996-09-30	11791
1996-12-31	13902
1997-03-31	15213
1997-06-30	17680
1997-09-30	20392
1997-12-31	22482
1998-03-31	25129
1998-06-30	27230
1998-09-30	18633
1998-12-31	18249