Bi-annual	US dollars
1987-06-30	2
1987-12-31	15
1988-06-30	15
1988-12-31	22
1989-06-30	28
1989-12-31	16
1990-06-30	9
1990-12-31	8
1991-06-30	13
1991-12-31	19
1992-06-30	27
1992-12-31	59
1993-06-30	33
1993-12-31	21
1994-06-30	40
1994-12-31	25
1995-06-30	45
1995-12-31	43
1996-06-30	36
1996-12-31	80
1997-06-30	72
1997-12-31	77
1998-06-30	32
1998-12-31	87
1999-06-30	16