Bi-annual	US dollars
1987-06-30	61
1987-12-31	30
1988-06-30	34
1988-12-31	195
1989-06-30	96
1989-12-31	266
1990-06-30	185
1990-12-31	102
1991-06-30	83
1991-12-31	134
1992-06-30	173
1992-12-31	114
1993-06-30	86
1993-12-31	47
1994-06-30	90
1994-12-31	177
1995-06-30	226
1995-12-31	282
1996-06-30	261
1996-12-31	591
1997-06-30	484
1997-12-31	240
1998-06-30	193
1998-12-31	305
1999-06-30	180