Bi-annual	US dollars
1987-06-30	16
1987-12-31	15
1988-06-30	12
1988-12-31	18
1989-06-30	17
1989-12-31	32
1990-06-30	16
1990-12-31	15
1991-06-30	15
1991-12-31	15
1992-06-30	13
1992-12-31	12
1993-06-30	30
1993-12-31	33
1994-06-30	35
1994-12-31	38
1995-06-30	46
1995-12-31	40
1996-06-30	75
1996-12-31	55
1997-06-30	57
1997-12-31	48
1998-06-30	53
1998-12-31	68
1999-06-30	38