Bi-annual	US dollars
1987-06-30	205
1987-12-31	266
1988-06-30	251
1988-12-31	251
1989-06-30	231
1989-12-31	223
1990-06-30	218
1990-12-31	191
1991-06-30	139
1991-12-31	146
1992-06-30	162
1992-12-31	147
1993-06-30	159
1993-12-31	139
1994-06-30	147
1994-12-31	153
1995-06-30	142
1995-12-31	133
1996-06-30	138
1996-12-31	154
1997-06-30	171
1997-12-31	51
1998-06-30	30
1998-12-31	18
1999-06-30	22