Bi-annual	US dollars
1987-06-30	443
1987-12-31	508
1988-06-30	582
1988-12-31	1159
1989-06-30	772
1989-12-31	1345
1990-06-30	668
1990-12-31	386
1991-06-30	491
1991-12-31	551
1992-06-30	502
1992-12-31	612
1993-06-30	869
1993-12-31	439
1994-06-30	540
1994-12-31	548
1995-06-30	557
1995-12-31	623
1996-06-30	536
1996-12-31	330
1997-06-30	635
1997-12-31	482
1998-06-30	398
1998-12-31	829
1999-06-30	1985