Bi-annual	US dollars
1987-06-30	11
1987-12-31	13
1988-06-30	14
1988-12-31	18
1989-06-30	23
1989-12-31	18
1990-06-30	30
1990-12-31	15
1991-06-30	18
1991-12-31	11
1992-06-30	4
1992-12-31	14
1993-06-30	8
1993-12-31	15
1994-06-30	8
1994-12-31	2
1995-06-30	3
1995-12-31	6
1996-06-30	2
1996-12-31	2
1997-06-30	15
1997-12-31	39
1998-06-30	20
1998-12-31	20
1999-06-30	16