Bi-annual	US dollars
1987-06-30	8
1987-12-31	8
1988-06-30	10
1988-12-31	11
1989-06-30	9
1989-12-31	10
1990-06-30	12
1990-12-31	17
1991-06-30	10
1991-12-31	17
1992-06-30	15
1992-12-31	12
1993-06-30	14
1993-12-31	12
1994-06-30	17
1994-12-31	17
1995-06-30	16
1995-12-31	12
1996-06-30	14
1996-12-31	17
1997-06-30	17
1997-12-31	23
1998-06-30	23
1998-12-31	27
1999-06-30	25