Bi-annual	US dollars
1987-06-30	176
1987-12-31	175
1988-06-30	113
1988-12-31	228
1989-06-30	260
1989-12-31	245
1990-06-30	218
1990-12-31	176
1991-06-30	143
1991-12-31	172
1992-06-30	169
1992-12-31	150
1993-06-30	249
1993-12-31	328
1994-06-30	387
1994-12-31	466
1995-06-30	624
1995-12-31	546
1996-06-30	631
1996-12-31	609
1997-06-30	527
1997-12-31	469
1998-06-30	509
1998-12-31	829
1999-06-30	702