Bi-annual	US dollars
1987-06-30	45
1987-12-31	53
1988-06-30	58
1988-12-31	56
1989-06-30	47
1989-12-31	48
1990-06-30	44
1990-12-31	46
1991-06-30	47
1991-12-31	54
1992-06-30	53
1992-12-31	64
1993-06-30	56
1993-12-31	56
1994-06-30	56
1994-12-31	53
1995-06-30	25
1995-12-31	102
1996-06-30	54
1996-12-31	63
1997-06-30	75
1997-12-31	58
1998-06-30	80
1998-12-31	42
1999-06-30	65