Bi-annual	US dollars
1987-06-30	13
1987-12-31	11
1988-06-30	9
1988-12-31	16
1989-06-30	14
1989-12-31	23
1990-06-30	9
1990-12-31	12
1991-06-30	13
1991-12-31	15
1992-06-30	17
1992-12-31	24
1993-06-30	15
1993-12-31	15
1994-06-30	31
1994-12-31	11
1995-06-30	16
1995-12-31	16
1996-06-30	12
1996-12-31	12
1997-06-30	12
1997-12-31	23
1998-06-30	20
1998-12-31	20
1999-06-30	17