Bi-annual	US dollars
1987-06-30	102
1987-12-31	75
1988-06-30	121
1988-12-31	63
1989-06-30	121
1989-12-31	118
1990-06-30	61
1990-12-31	79
1991-06-30	128
1991-12-31	93
1992-06-30	61
1992-12-31	58
1993-06-30	54
1993-12-31	68
1994-06-30	68
1994-12-31	58
1995-06-30	81
1995-12-31	119
1996-06-30	67
1996-12-31	108
1997-06-30	165
1997-12-31	174
1998-06-30	315
1998-12-31	434
1999-06-30	418