Bi-annual	US dollars
1987-06-30	268
1987-12-31	302
1988-06-30	287
1988-12-31	295
1989-06-30	268
1989-12-31	297
1990-06-30	349
1990-12-31	338
1991-06-30	293
1991-12-31	306
1992-06-30	293
1992-12-31	230
1993-06-30	224
1993-12-31	192
1994-06-30	190
1994-12-31	152
1995-06-30	142
1995-12-31	122
1996-06-30	101
1996-12-31	152
1997-06-30	176
1997-12-31	201
1998-06-30	190
1998-12-31	196
1999-06-30	151