Bi-annual	US dollars
1987-06-30	350
1987-12-31	374
1988-06-30	363
1988-12-31	372
1989-06-30	363
1989-12-31	314
1990-06-30	324
1990-12-31	397
1991-06-30	428
1991-12-31	336
1992-06-30	369
1992-12-31	320
1993-06-30	333
1993-12-31	324
1994-06-30	335
1994-12-31	329
1995-06-30	302
1995-12-31	285
1996-06-30	309
1996-12-31	337
1997-06-30	265
1997-12-31	247
1998-06-30	212
1998-12-31	283
1999-06-30	266