Quarter	US dollars
1986-09-30	20165
1986-12-31	22083
1987-03-31	24734
1987-06-30	27293
1987-09-30	27743
1987-12-31	31255
1988-03-31	29350
1988-06-30	27881
1988-09-30	27061
1988-12-31	26960
1989-03-31	26175
1989-06-30	24646
1989-09-30	26099
1989-12-31	27746
1990-03-31	27929
1990-06-30	29050
1990-09-30	30472
1990-12-31	31613
1991-03-31	29557
1991-06-30	29169
1991-09-30	30874
1991-12-31	30871
1992-03-31	28145
1992-06-30	32269
1992-09-30	33199
1992-12-31	27565
1993-03-31	27177
1993-06-30	26277
1993-09-30	24731
1993-12-31	26536
1994-03-31	29252
1994-06-30	30160
1994-09-30	30634
1994-12-31	31066
1995-03-31	31599
1995-06-30	31243
1995-09-30	33799
1995-12-31	31515
1996-03-31	31106
1996-06-30	32367
1996-09-30	32395
1996-12-31	31110
1997-03-31	29396
1997-06-30	29204
1997-09-30	28702
1997-12-31	33355
1998-03-31	33730
1998-06-30	35968
1998-09-30	32173
1998-12-31	32808