Bi-annual	US dollars
1987-06-30	152
1987-12-31	391
1988-06-30	384
1988-12-31	438
1989-06-30	412
1989-12-31	685
1990-06-30	582
1990-12-31	753
1991-06-30	483
1991-12-31	631
1992-06-30	253
1992-12-31	332
1993-06-30	239
1993-12-31	337
1994-06-30	398
1994-12-31	272
1995-06-30	321
1995-12-31	698
1996-06-30	674
1996-12-31	743
1997-06-30	737
1997-12-31	938
1998-06-30	930
1998-12-31	850
1999-06-30	604