Quarter	US dollars
1986-09-30	10713
1986-12-31	11869
1987-03-31	11556
1987-06-30	12458
1987-09-30	11534
1987-12-31	10650
1988-03-31	8855
1988-06-30	8518
1988-09-30	8055
1988-12-31	8950
1989-03-31	8311
1989-06-30	7776
1989-09-30	7968
1989-12-31	9085
1990-03-31	8977
1990-06-30	8590
1990-09-30	8755
1990-12-31	8958
1991-03-31	7934
1991-06-30	7624
1991-09-30	7967
1991-12-31	7984
1992-03-31	8275
1992-06-30	8545
1992-09-30	8872
1992-12-31	8643
1993-03-31	8755
1993-06-30	8789
1993-09-30	8948
1993-12-31	9086
1994-03-31	9452
1994-06-30	9392
1994-09-30	9506
1994-12-31	10153
1995-03-31	9941
1995-06-30	9689
1995-09-30	9342
1995-12-31	10003
1996-03-31	10732
1996-06-30	12992
1996-09-30	14505
1996-12-31	15163
1997-03-31	13942
1997-06-30	16112
1997-09-30	15217
1997-12-31	17057
1998-03-31	19261
1998-06-30	18432
1998-09-30	27116
1998-12-31	15613