Bi-annual	US dollars
1987-06-30	18
1987-12-31	23
1988-06-30	24
1988-12-31	18
1989-06-30	22
1989-12-31	21
1990-06-30	21
1990-12-31	27
1991-06-30	24
1991-12-31	39
1992-06-30	40
1992-12-31	32
1993-06-30	30
1993-12-31	15
1994-06-30	17
1994-12-31	13
1995-06-30	13
1995-12-31	12
1996-06-30	11
1996-12-31	9
1997-06-30	5
1997-12-31	10
1998-06-30	3
1998-12-31	3
1999-06-30	5