Bi-annual	US dollars
1987-06-30	927
1987-12-31	1240
1988-06-30	1100
1988-12-31	1074
1989-06-30	794
1989-12-31	716
1990-06-30	809
1990-12-31	828
1991-06-30	632
1991-12-31	697
1992-06-30	976
1992-12-31	701
1993-06-30	902
1993-12-31	798
1994-06-30	739
1994-12-31	703
1995-06-30	843
1995-12-31	863
1996-06-30	736
1996-12-31	1023
1997-06-30	1206
1997-12-31	1708
1998-06-30	1466
1998-12-31	1538
1999-06-30	1462