Quarter	US dollars
1986-09-30	16413
1986-12-31	16265
1987-03-31	16239
1987-06-30	16375
1987-09-30	16122
1987-12-31	16792
1988-03-31	16043
1988-06-30	16089
1988-09-30	16063
1988-12-31	16788
1989-03-31	15740
1989-06-30	15754
1989-09-30	16086
1989-12-31	16596
1990-03-31	17127
1990-06-30	18234
1990-09-30	18665
1990-12-31	18417
1991-03-31	17305
1991-06-30	16727
1991-09-30	17178
1991-12-31	17714
1992-03-31	17998
1992-06-30	18947
1992-09-30	19174
1992-12-31	18542
1993-03-31	18472
1993-06-30	18967
1993-09-30	19453
1993-12-31	20457
1994-03-31	20150
1994-06-30	21007
1994-09-30	21718
1994-12-31	22106
1995-03-31	23068
1995-06-30	23325
1995-09-30	24173
1995-12-31	29086
1996-03-31	31289
1996-06-30	33910
1996-09-30	35255
1996-12-31	39254
1997-03-31	40498
1997-06-30	42343
1997-09-30	56306
1997-12-31	55997
1998-03-31	61388
1998-06-30	59924
1998-09-30	62160
1998-12-31	61968