Bi-annual	US dollars
1987-06-30	79
1987-12-31	92
1988-06-30	68
1988-12-31	74
1989-06-30	68
1989-12-31	144
1990-06-30	94
1990-12-31	98
1991-06-30	161
1991-12-31	196
1992-06-30	173
1992-12-31	150
1993-06-30	83
1993-12-31	140
1994-06-30	190
1994-12-31	155
1995-06-30	223
1995-12-31	229
1996-06-30	253
1996-12-31	192
1997-06-30	208
1997-12-31	158
1998-06-30	92
1998-12-31	193
1999-06-30	114