Bi-annual	US dollars
1987-06-30	1097
1987-12-31	981
1988-06-30	906
1988-12-31	819
1989-06-30	839
1989-12-31	834
1990-06-30	680
1990-12-31	785
1991-06-30	816
1991-12-31	783
1992-06-30	1030
1992-12-31	976
1993-06-30	1487
1993-12-31	1797
1994-06-30	1912
1994-12-31	1760
1995-06-30	2081
1995-12-31	1851
1996-06-30	1983
1996-12-31	2506
1997-06-30	2411
1997-12-31	2141
1998-06-30	2221
1998-12-31	1489
1999-06-30	2841