Bi-annual	US dollars
1987-06-30	840
1987-12-31	874
1988-06-30	936
1988-12-31	1117
1989-06-30	958
1989-12-31	697
1990-06-30	539
1990-12-31	430
1991-06-30	316
1991-12-31	194
1992-06-30	398
1992-12-31	339
1993-06-30	342
1993-12-31	364
1994-06-30	489
1994-12-31	721
1995-06-30	224
1995-12-31	212
1996-06-30	297
1996-12-31	337
1997-06-30	394
1997-12-31	265
1998-06-30	442
1998-12-31	411
1999-06-30	287