Bi-annual	US dollars
1987-06-30	94
1987-12-31	123
1988-06-30	118
1988-12-31	125
1989-06-30	93
1989-12-31	95
1990-06-30	103
1990-12-31	100
1991-06-30	104
1991-12-31	108
1992-06-30	126
1992-12-31	133
1993-06-30	113
1993-12-31	106
1994-06-30	130
1994-12-31	108
1995-06-30	102
1995-12-31	150
1996-06-30	93
1996-12-31	139
1997-06-30	91
1997-12-31	84
1998-06-30	145
1998-12-31	120
1999-06-30	143