Bi-annual	US dollars
1987-06-30	100
1987-12-31	130
1988-06-30	114
1988-12-31	123
1989-06-30	90
1989-12-31	89
1990-06-30	98
1990-12-31	96
1991-06-30	102
1991-12-31	114
1992-06-30	122
1992-12-31	126
1993-06-30	117
1993-12-31	92
1994-06-30	125
1994-12-31	99
1995-06-30	89
1995-12-31	169
1996-06-30	112
1996-12-31	122
1997-06-30	118
1997-12-31	102
1998-06-30	177
1998-12-31	146
1999-06-30	159