Quarter	US dollars
1986-09-30	18187
1986-12-31	18729
1987-03-31	18971
1987-06-30	19046
1987-09-30	18585
1987-12-31	19512
1988-03-31	19168
1988-06-30	18344
1988-09-30	18276
1988-12-31	17333
1989-03-31	16285
1989-06-30	15761
1989-09-30	16260
1989-12-31	15112
1990-03-31	14725
1990-06-30	15130
1990-09-30	14898
1990-12-31	14019
1991-03-31	13417
1991-06-30	12678
1991-09-30	12891
1991-12-31	12875
1992-03-31	12463
1992-06-30	12647
1992-09-30	12898
1992-12-31	12513
1993-03-31	11783
1993-06-30	11392
1993-09-30	11129
1993-12-31	10476
1994-03-31	10187
1994-06-30	10989
1994-09-30	10234
1994-12-31	10419
1995-03-31	10640
1995-06-30	10401
1995-09-30	10214
1995-12-31	10640
1996-03-31	10592
1996-06-30	11119
1996-09-30	11268
1996-12-31	12825
1997-03-31	14122
1997-06-30	14278
1997-09-30	14896
1997-12-31	14719
1998-03-31	15561
1998-06-30	14190
1998-09-30	14089
1998-12-31	14081