Bi-annual	US dollars
1987-06-30	366
1987-12-31	413
1988-06-30	404
1988-12-31	385
1989-06-30	397
1989-12-31	432
1990-06-30	459
1990-12-31	465
1991-06-30	439
1991-12-31	555
1992-06-30	872
1992-12-31	630
1993-06-30	719
1993-12-31	610
1994-06-30	727
1994-12-31	767
1995-06-30	725
1995-12-31	755
1996-06-30	875
1996-12-31	697
1997-06-30	820
1997-12-31	874
1998-06-30	1042
1998-12-31	850
1999-06-30	653