Quarter	US dollars
1986-09-30	7160
1986-12-31	8136
1987-03-31	7219
1987-06-30	7316
1987-09-30	7600
1987-12-31	8759
1988-03-31	7824
1988-06-30	7558
1988-09-30	7760
1988-12-31	9426
1989-03-31	8136
1989-06-30	8788
1989-09-30	9557
1989-12-31	9825
1990-03-31	8873
1990-06-30	8163
1990-09-30	8971
1990-12-31	6076
1991-03-31	3896
1991-06-30	3875
1991-09-30	5312
1991-12-31	5508
1992-03-31	5598
1992-06-30	6984
1992-09-30	8572
1992-12-31	7712
1993-03-31	8936
1993-06-30	9310
1993-09-30	9819
1993-12-31	8046
1994-03-31	9373
1994-06-30	9254
1994-09-30	9030
1994-12-31	9566
1995-03-31	9934
1995-06-30	10979
1995-09-30	13382
1995-12-31	15228
1996-03-31	14899
1996-06-30	14506
1996-09-30	12980
1996-12-31	14777
1997-03-31	15153
1997-06-30	18649
1997-09-30	18040
1997-12-31	17298
1998-03-31	15046
1998-06-30	17572
1998-09-30	16357
1998-12-31	13271