Quarter	US dollars
1986-09-30	8607
1986-12-31	8471
1987-03-31	9393
1987-06-30	9669
1987-09-30	10204
1987-12-31	11473
1988-03-31	11605
1988-06-30	11258
1988-09-30	11371
1988-12-31	11804
1989-03-31	11502
1989-06-30	11637
1989-09-30	13919
1989-12-31	13455
1990-03-31	13453
1990-06-30	14616
1990-09-30	15134
1990-12-31	15554
1991-03-31	13671
1991-06-30	13490
1991-09-30	14084
1991-12-31	15559
1992-03-31	14641
1992-06-30	15753
1992-09-30	15235
1992-12-31	13593
1993-03-31	13957
1993-06-30	13091
1993-09-30	13354
1993-12-31	13327
1994-03-31	13434
1994-06-30	13979
1994-09-30	14768
1994-12-31	14465
1995-03-31	15097
1995-06-30	14659
1995-09-30	14608
1995-12-31	14211
1996-03-31	14749
1996-06-30	15445
1996-09-30	15167
1996-12-31	16104
1997-03-31	17368
1997-06-30	17180
1997-09-30	16713
1997-12-31	17141
1998-03-31	16969
1998-06-30	17904
1998-09-30	16693
1998-12-31	16055