Bi-annual	US dollars
1987-06-30	31
1987-12-31	28
1988-06-30	31
1988-12-31	45
1989-06-30	50
1989-12-31	58
1990-06-30	54
1990-12-31	52
1991-06-30	57
1991-12-31	65
1992-06-30	70
1992-12-31	68
1993-06-30	54
1993-12-31	49
1994-06-30	51
1994-12-31	66
1995-06-30	67
1995-12-31	68
1996-06-30	90
1996-12-31	77
1997-06-30	93
1997-12-31	145
1998-06-30	60
1998-12-31	53
1999-06-30	63