Bi-annual	US dollars
1987-06-30	603
1987-12-31	653
1988-06-30	597
1988-12-31	687
1989-06-30	629
1989-12-31	677
1990-06-30	310
1990-12-31	315
1991-06-30	272
1991-12-31	342
1992-06-30	440
1992-12-31	485
1993-06-30	512
1993-12-31	440
1994-06-30	375
1994-12-31	451
1995-06-30	509
1995-12-31	535
1996-06-30	364
1996-12-31	346
1997-06-30	173
1997-12-31	212
1998-06-30	410
1998-12-31	263
1999-06-30	244