Bi-annual	US dollars
1987-06-30	858
1987-12-31	944
1988-06-30	861
1988-12-31	868
1989-06-30	842
1989-12-31	851
1990-06-30	827
1990-12-31	893
1991-06-30	767
1991-12-31	867
1992-06-30	872
1992-12-31	829
1993-06-30	725
1993-12-31	704
1994-06-30	736
1994-12-31	787
1995-06-30	711
1995-12-31	764
1996-06-30	760
1996-12-31	697
1997-06-30	561
1997-12-31	801
1998-06-30	802
1998-12-31	757
1999-06-30	877