Bi-annual	US dollars
1987-06-30	1169
1987-12-31	923
1988-06-30	679
1988-12-31	707
1989-06-30	522
1989-12-31	472
1990-06-30	473
1990-12-31	521
1991-06-30	624
1991-12-31	755
1992-06-30	769
1992-12-31	701
1993-06-30	923
1993-12-31	690
1994-06-30	758
1994-12-31	674
1995-06-30	503
1995-12-31	1022
1996-06-30	887
1996-12-31	1231
1997-06-30	1554
1997-12-31	406
1998-06-30	675
1998-12-31	631
1999-06-30	787