Bi-annual	US dollars
1987-06-30	35
1987-12-31	42
1988-06-30	15
1988-12-31	31
1989-06-30	45
1989-12-31	56
1990-06-30	56
1990-12-31	71
1991-06-30	99
1991-12-31	105
1992-06-30	143
1992-12-31	89
1993-06-30	197
1993-12-31	182
1994-06-30	256
1994-12-31	274
1995-06-30	267
1995-12-31	352
1996-06-30	329
1996-12-31	541
1997-06-30	582
1997-12-31	658
1998-06-30	467
1998-12-31	421
1999-06-30	437