Bi-annual	US dollars
1987-06-30	300
1987-12-31	423
1988-06-30	377
1988-12-31	295
1989-06-30	155
1989-12-31	76
1990-06-30	119
1990-12-31	33
1991-06-30	251
1991-12-31	241
1992-06-30	175
1992-12-31	133
1993-06-30	159
1993-12-31	508
1994-06-30	481
1994-12-31	538
1995-06-30	94
1995-12-31	29
1996-06-30	44
1996-12-31	382
1997-06-30	504
1997-12-31	587
1998-06-30	440
1998-12-31	273
1999-06-30	265