Bi-annual	US dollars
1987-06-30	2
1987-12-31	2
1988-06-30	5
1988-12-31	22
1989-06-30	20
1989-12-31	10
1990-06-30	17
1990-12-31	14
1991-06-30	15
1991-12-31	32
1992-06-30	27
1992-12-31	18
1993-06-30	30
1993-12-31	40
1994-06-30	52
1994-12-31	64
1995-06-30	52
1995-12-31	25
1996-06-30	28
1996-12-31	33
1997-06-30	25
1997-12-31	39
1998-06-30	0
1998-12-31	2
1999-06-30	-9