Bi-annual	US dollars
1987-06-30	90
1987-12-31	145
1988-06-30	210
1988-12-31	260
1989-06-30	206
1989-12-31	163
1990-06-30	113
1990-12-31	127
1991-06-30	112
1991-12-31	110
1992-06-30	89
1992-12-31	67
1993-06-30	95
1993-12-31	118
1994-06-30	159
1994-12-31	116
1995-06-30	153
1995-12-31	78
1996-06-30	210
1996-12-31	240
1997-06-30	155
1997-12-31	89
1998-06-30	83
1998-12-31	102
1999-06-30	77