Bi-annual	US dollars
1987-06-30	48
1987-12-31	53
1988-06-30	51
1988-12-31	49
1989-06-30	47
1989-12-31	48
1990-06-30	47
1990-12-31	50
1991-06-30	50
1991-12-31	52
1992-06-30	51
1992-12-31	45
1993-06-30	41
1993-12-31	35
1994-06-30	34
1994-12-31	33
1995-06-30	30
1995-12-31	28
1996-06-30	28
1996-12-31	10
1997-06-30	8
1997-12-31	7
1998-06-30	5
1998-12-31	13
1999-06-30	5