Bi-annual	US dollars
1987-06-30	815
1987-12-31	838
1988-06-30	707
1988-12-31	652
1989-06-30	687
1989-12-31	442
1990-06-30	527
1990-12-31	595
1991-06-30	598
1991-12-31	640
1992-06-30	638
1992-12-31	487
1993-06-30	478
1993-12-31	915
1994-06-30	929
1994-12-31	891
1995-06-30	929
1995-12-31	913
1996-06-30	1268
1996-12-31	1518
1997-06-30	1024
1997-12-31	793
1998-06-30	505
1998-12-31	361
1999-06-30	546