Bi-annual	US dollars
1987-06-30	71
1987-12-31	68
1988-06-30	68
1988-12-31	61
1989-06-30	54
1989-12-31	48
1990-06-30	49
1990-12-31	31
1991-06-30	32
1991-12-31	34
1992-06-30	38
1992-12-31	30
1993-06-30	45
1993-12-31	47
1994-06-30	52
1994-12-31	78
1995-06-30	56
1995-12-31	62
1996-06-30	68
1996-12-31	79
1997-06-30	77
1997-12-31	72
1998-06-30	68
1998-12-31	63
1999-06-30	60