Bi-annual	US dollars
1987-06-30	813
1987-12-31	443
1988-06-30	450
1988-12-31	450
1989-06-30	350
1989-12-31	903
1990-06-30	1055
1990-12-31	982
1991-06-30	984
1991-12-31	784
1992-06-30	1073
1992-12-31	885
1993-06-30	749
1993-12-31	944
1994-06-30	1159
1994-12-31	1303
1995-06-30	1203
1995-12-31	1127
1996-06-30	1055
1996-12-31	794
1997-06-30	757
1997-12-31	885
1998-06-30	767
1998-12-31	747
1999-06-30	453