Bi-annual	US dollars
1987-06-30	632
1987-12-31	802
1988-06-30	747
1988-12-31	711
1989-06-30	687
1989-12-31	690
1990-06-30	659
1990-12-31	733
1991-06-30	817
1991-12-31	656
1992-06-30	723
1992-12-31	670
1993-06-30	944
1993-12-31	931
1994-06-30	1056
1994-12-31	1067
1995-06-30	1055
1995-12-31	848
1996-06-30	819
1996-12-31	813
1997-06-30	853
1997-12-31	862
1998-06-30	972
1998-12-31	900
1999-06-30	837