Bi-annual	US dollars
1987-06-30	1251
1987-12-31	1198
1988-06-30	1061
1988-12-31	1018
1989-06-30	929
1989-12-31	456
1990-06-30	490
1990-12-31	531
1991-06-30	493
1991-12-31	676
1992-06-30	704
1992-12-31	548
1993-06-30	720
1993-12-31	658
1994-06-30	659
1994-12-31	817
1995-06-30	647
1995-12-31	817
1996-06-30	513
1996-12-31	582
1997-06-30	443
1997-12-31	564
1998-06-30	692
1998-12-31	975
1999-06-30	1003