Bi-annual	US dollars
1987-06-30	393
1987-12-31	389
1988-06-30	363
1988-12-31	356
1989-06-30	350
1989-12-31	276
1990-06-30	265
1990-12-31	262
1991-06-30	284
1991-12-31	340
1992-06-30	282
1992-12-31	214
1993-06-30	258
1993-12-31	232
1994-06-30	227
1994-12-31	230
1995-06-30	274
1995-12-31	281
1996-06-30	328
1996-12-31	294
1997-06-30	346
1997-12-31	454
1998-06-30	772
1998-12-31	837
1999-06-30	788