Bi-annual	US dollars
1987-06-30	19
1987-12-31	15
1988-06-30	12
1988-12-31	5
1989-06-30	5
1989-12-31	10
1990-06-30	7
1990-12-31	4
1991-06-30	8
1991-12-31	15
1992-06-30	27
1992-12-31	23
1993-06-30	32
1993-12-31	18
1994-06-30	19
1994-12-31	31
1995-06-30	38
1995-12-31	37
1996-06-30	59
1996-12-31	55
1997-06-30	7
1997-12-31	3
1998-06-30	40
1998-12-31	35
1999-06-30	27