Bi-annual	US dollars
1987-06-30	252
1987-12-31	285
1988-06-30	266
1988-12-31	217
1989-06-30	146
1989-12-31	123
1990-06-30	237
1990-12-31	233
1991-06-30	198
1991-12-31	179
1992-06-30	188
1992-12-31	221
1993-06-30	192
1993-12-31	155
1994-06-30	134
1994-12-31	207
1995-06-30	356
1995-12-31	281
1996-06-30	141
1996-12-31	233
1997-06-30	153
1997-12-31	313
1998-06-30	610
1998-12-31	305
1999-06-30	177