Bi-annual	US dollars
1987-06-30	94
1987-12-31	92
1988-06-30	84
1988-12-31	76
1989-06-30	60
1989-12-31	58
1990-06-30	47
1990-12-31	41
1991-06-30	32
1991-12-31	49
1992-06-30	34
1992-12-31	29
1993-06-30	41
1993-12-31	43
1994-06-30	54
1994-12-31	58
1995-06-30	60
1995-12-31	65
1996-06-30	70
1996-12-31	79
1997-06-30	75
1997-12-31	74
1998-06-30	70
1998-12-31	65
1999-06-30	60