Bi-annual	US dollars
1987-06-30	693
1987-12-31	530
1988-06-30	425
1988-12-31	618
1989-06-30	727
1989-12-31	413
1990-06-30	563
1990-12-31	681
1991-06-30	451
1991-12-31	603
1992-06-30	552
1992-12-31	504
1993-06-30	492
1993-12-31	587
1994-06-30	670
1994-12-31	346
1995-06-30	430
1995-12-31	375
1996-06-30	575
1996-12-31	284
1997-06-30	807
1997-12-31	757
1998-06-30	537
1998-12-31	612
1999-06-30	845