Bi-annual	US dollars
1987-06-30	192
1987-12-31	83
1988-06-30	73
1988-12-31	78
1989-06-30	98
1989-12-31	100
1990-06-30	106
1990-12-31	139
1991-06-30	66
1991-12-31	142
1992-06-30	166
1992-12-31	117
1993-06-30	84
1993-12-31	71
1994-06-30	68
1994-12-31	66
1995-06-30	64
1995-12-31	64
1996-06-30	64
1996-12-31	68
1997-06-30	95
1997-12-31	117
1998-06-30	208
1998-12-31	190
1999-06-30	158