Bi-annual	US dollars
1987-06-30	137
1987-12-31	208
1988-06-30	217
1988-12-31	188
1989-06-30	284
1989-12-31	276
1990-06-30	251
1990-12-31	228
1991-06-30	224
1991-12-31	233
1992-06-30	249
1992-12-31	230
1993-06-30	225
1993-12-31	256
1994-06-30	205
1994-12-31	264
1995-06-30	68
1995-12-31	98
1996-06-30	132
1996-12-31	116
1997-06-30	151
1997-12-31	122
1998-06-30	157
1998-12-31	140
1999-06-30	178