Bi-annual	US dollars
1987-06-30	542
1987-12-31	313
1988-06-30	331
1988-12-31	495
1989-06-30	367
1989-12-31	227
1990-06-30	251
1990-12-31	390
1991-06-30	251
1991-12-31	297
1992-06-30	276
1992-12-31	227
1993-06-30	249
1993-12-31	265
1994-06-30	370
1994-12-31	178
1995-06-30	224
1995-12-31	135
1996-06-30	241
1996-12-31	46
1997-06-30	547
1997-12-31	467
1998-06-30	365
1998-12-31	364
1999-06-30	246