Bi-annual	US dollars
1987-06-30	89
1987-12-31	79
1988-06-30	53
1988-12-31	108
1989-06-30	88
1989-12-31	94
1990-06-30	157
1990-12-31	81
1991-06-30	92
1991-12-31	120
1992-06-30	110
1992-12-31	91
1993-06-30	150
1993-12-31	52
1994-06-30	51
1994-12-31	80
1995-06-30	94
1995-12-31	84
1996-06-30	141
1996-12-31	92
1997-06-30	91
1997-12-31	117
1998-06-30	113
1998-12-31	130
1999-06-30	33