Bi-annual	US dollars
1987-06-30	39
1987-12-31	28
1988-06-30	14
1988-12-31	20
1989-06-30	47
1989-12-31	47
1990-06-30	44
1990-12-31	60
1991-06-30	15
1991-12-31	30
1992-06-30	23
1992-12-31	24
1993-06-30	18
1993-12-31	10
1994-06-30	11
1994-12-31	13
1995-06-30	21
1995-12-31	20
1996-06-30	6
1996-12-31	27
1997-06-30	32
1997-12-31	53
1998-06-30	30
1998-12-31	48
1999-06-30	50