Bi-annual	US dollars
1987-06-30	8
1987-12-31	21
1988-06-30	19
1988-12-31	13
1989-06-30	17
1989-12-31	21
1990-06-30	16
1990-12-31	14
1991-06-30	5
1991-12-31	4
1992-06-30	10
1992-12-31	6
1993-06-30	24
1993-12-31	18
1994-06-30	25
1994-12-31	31
1995-06-30	35
1995-12-31	37
1996-06-30	47
1996-12-31	53
1997-06-30	75
1997-12-31	74
1998-06-30	100
1998-12-31	140
1999-06-30	101