Bi-annual	US dollars
1987-06-30	210
1987-12-31	172
1988-06-30	157
1988-12-31	146
1989-06-30	138
1989-12-31	147
1990-06-30	157
1990-12-31	151
1991-06-30	112
1991-12-31	172
1992-06-30	133
1992-12-31	336
1993-06-30	186
1993-12-31	197
1994-06-30	176
1994-12-31	291
1995-06-30	247
1995-12-31	254
1996-06-30	218
1996-12-31	228
1997-06-30	331
1997-12-31	441
1998-06-30	352
1998-12-31	381
1999-06-30	334