Bi-annual	US dollars
1987-06-30	813
1987-12-31	902
1988-06-30	832
1988-12-31	656
1989-06-30	708
1989-12-31	668
1990-06-30	788
1990-12-31	463
1991-06-30	285
1991-12-31	362
1992-06-30	350
1992-12-31	323
1993-06-30	407
1993-12-31	511
1994-06-30	543
1994-12-31	577
1995-06-30	640
1995-12-31	471
1996-06-30	710
1996-12-31	717
1997-06-30	644
1997-12-31	740
1998-06-30	839
1998-12-31	752
1999-06-30	779