Bi-annual	US dollars
1987-06-30	818
1987-12-31	889
1988-06-30	1095
1988-12-31	725
1989-06-30	733
1989-12-31	979
1990-06-30	617
1990-12-31	365
1991-06-30	279
1991-12-31	403
1992-06-30	363
1992-12-31	750
1993-06-30	417
1993-12-31	328
1994-06-30	319
1994-12-31	466
1995-06-30	500
1995-12-31	400
1996-06-30	334
1996-12-31	416
1997-06-30	910
1997-12-31	484
1998-06-30	297
1998-12-31	644
1999-06-30	194