Bi-annual	US dollars
1987-06-30	3823
1987-12-31	4599
1988-06-30	4583
1988-12-31	4196
1989-06-30	5071
1989-12-31	5181
1990-06-30	5605
1990-12-31	6925
1991-06-30	5846
1991-12-31	6763
1992-06-30	7583
1992-12-31	6880
1993-06-30	7490
1993-12-31	7069
1994-06-30	7560
1994-12-31	9178
1995-06-30	8253
1995-12-31	7465
1996-06-30	8514
1996-12-31	7929
1997-06-30	7252
1997-12-31	7481
1998-06-30	8350
1998-12-31	9373
1999-06-30	8920