Bi-annual	US dollars
1987-06-30	242
1987-12-31	264
1988-06-30	258
1988-12-31	253
1989-06-30	290
1989-12-31	284
1990-06-30	344
1990-12-31	224
1991-06-30	154
1991-12-31	183
1992-06-30	188
1992-12-31	167
1993-06-30	191
1993-12-31	263
1994-06-30	224
1994-12-31	333
1995-06-30	258
1995-12-31	180
1996-06-30	365
1996-12-31	382
1997-06-30	284
1997-12-31	327
1998-06-30	385
1998-12-31	296
1999-06-30	292