Bi-annual	US dollars
1987-06-30	108
1987-12-31	147
1988-06-30	136
1988-12-31	199
1989-06-30	175
1989-12-31	216
1990-06-30	143
1990-12-31	135
1991-06-30	81
1991-12-31	82
1992-06-30	120
1992-12-31	70
1993-06-30	51
1993-12-31	62
1994-06-30	52
1994-12-31	83
1995-06-30	38
1995-12-31	68
1996-06-30	179
1996-12-31	140
1997-06-30	70
1997-12-31	117
1998-06-30	202
1998-12-31	473
1999-06-30	233