Bi-annual	US dollars
1987-06-30	1055
1987-12-31	1060
1988-06-30	1006
1988-12-31	1372
1989-06-30	1347
1989-12-31	818
1990-06-30	509
1990-12-31	511
1991-06-30	733
1991-12-31	743
1992-06-30	864
1992-12-31	653
1993-06-30	797
1993-12-31	837
1994-06-30	1049
1994-12-31	1126
1995-06-30	1304
1995-12-31	1123
1996-06-30	1179
1996-12-31	1103
1997-06-30	1033
1997-12-31	1048
1998-06-30	935
1998-12-31	1020
1999-06-30	1047