Bi-annual	US dollars
1987-06-30	160
1987-12-31	136
1988-06-30	131
1988-12-31	78
1989-06-30	71
1989-12-31	39
1990-06-30	91
1990-12-31	75
1991-06-30	39
1991-12-31	32
1992-06-30	78
1992-12-31	121
1993-06-30	108
1993-12-31	130
1994-06-30	293
1994-12-31	438
1995-06-30	372
1995-12-31	433
1996-06-30	452
1996-12-31	402
1997-06-30	521
1997-12-31	260
1998-06-30	272
1998-12-31	215
1999-06-30	191