Bi-annual	US dollars
1987-06-30	98
1987-12-31	123
1988-06-30	109
1988-12-31	99
1989-06-30	116
1989-12-31	100
1990-06-30	49
1990-12-31	75
1991-06-30	73
1991-12-31	84
1992-06-30	91
1992-12-31	70
1993-06-30	29
1993-12-31	46
1994-06-30	45
1994-12-31	61
1995-06-30	100
1995-12-31	121
1996-06-30	85
1996-12-31	214
1997-06-30	324
1997-12-31	140
1998-06-30	97
1998-12-31	291
1999-06-30	90