Bi-annual	US dollars
1987-06-30	15
1987-12-31	13
1988-06-30	9
1988-12-31	9
1989-06-30	11
1989-12-31	2
1990-06-30	10
1990-12-31	10
1991-06-30	3
1991-12-31	15
1992-06-30	32
1992-12-31	30
1993-06-30	81
1993-12-31	44
1994-06-30	28
1994-12-31	53
1995-06-30	121
1995-12-31	53
1996-06-30	65
1996-12-31	166
1997-06-30	87
1997-12-31	59
1998-06-30	42
1998-12-31	40
1999-06-30	278