Bi-annual	US dollars
1987-06-30	572
1987-12-31	521
1988-06-30	478
1988-12-31	342
1989-06-30	442
1989-12-31	337
1990-06-30	410
1990-12-31	278
1991-06-30	180
1991-12-31	336
1992-06-30	746
1992-12-31	724
1993-06-30	1047
1993-12-31	1088
1994-06-30	951
1994-12-31	846
1995-06-30	711
1995-12-31	972
1996-06-30	859
1996-12-31	859
1997-06-30	847
1997-12-31	803
1998-06-30	907
1998-12-31	859
1999-06-30	933