Bi-annual	US dollars
1987-06-30	3
1987-12-31	21
1988-06-30	15
1988-12-31	9
1989-06-30	20
1989-12-31	8
1990-06-30	87
1990-12-31	106
1991-06-30	66
1991-12-31	30
1992-06-30	21
1992-12-31	6
1993-06-30	3
1993-12-31	6
1994-06-30	22
1994-12-31	6
1995-06-30	32
1995-12-31	31
1996-06-30	8
1996-12-31	94
1997-06-30	30
1997-12-31	13
1998-06-30	25
1998-12-31	22
1999-06-30	9