Quarter	US dollars
1986-09-30	19637
1986-12-31	20434
1987-03-31	19901
1987-06-30	21000
1987-09-30	19728
1987-12-31	21506
1988-03-31	21430
1988-06-30	22374
1988-09-30	22043
1988-12-31	21805
1989-03-31	21756
1989-06-30	21348
1989-09-30	21475
1989-12-31	21903
1990-03-31	22383
1990-06-30	21645
1990-09-30	22434
1990-12-31	22409
1991-03-31	20375
1991-06-30	19314
1991-09-30	19750
1991-12-31	19048
1992-03-31	18782
1992-06-30	19435
1992-09-30	19397
1992-12-31	18405
1993-03-31	17639
1993-06-30	17747
1993-09-30	17086
1993-12-31	18206
1994-03-31	17781
1994-06-30	17632
1994-09-30	17516
1994-12-31	18613
1995-03-31	16454
1995-06-30	15286
1995-09-30	15509
1995-12-31	20162
1996-03-31	19976
1996-06-30	21925
1996-09-30	22354
1996-12-31	22264
1997-03-31	21448
1997-06-30	22596
1997-09-30	24243
1997-12-31	24864
1998-03-31	22094
1998-06-30	26931
1998-09-30	35191
1998-12-31	26012