Bi-annual	US dollars
1987-06-30	105
1987-12-31	109
1988-06-30	182
1988-12-31	52
1989-06-30	43
1989-12-31	40
1990-06-30	77
1990-12-31	266
1991-06-30	91
1991-12-31	49
1992-06-30	91
1992-12-31	88
1993-06-30	143
1993-12-31	112
1994-06-30	51
1994-12-31	131
1995-06-30	97
1995-12-31	70
1996-06-30	84
1996-12-31	108
1997-06-30	98
1997-12-31	92
1998-06-30	143
1998-12-31	47
1999-06-30	54