Bi-annual	US dollars
1987-06-30	5
1987-12-31	13
1988-06-30	3
1988-12-31	9
1989-06-30	47
1989-12-31	37
1990-06-30	5
1990-12-31	15
1991-06-30	11
1991-12-31	9
1992-06-30	57
1992-12-31	39
1993-06-30	26
1993-12-31	38
1994-06-30	26
1994-12-31	20
1995-06-30	33
1995-12-31	54
1996-06-30	3
1996-12-31	24
1997-06-30	3
1997-12-31	5
1998-06-30	2
1998-12-31	8
1999-06-30	22