Bi-annual	US dollars
1987-06-30	32
1987-12-31	26
1988-06-30	27
1988-12-31	20
1989-06-30	14
1989-12-31	13
1990-06-30	10
1990-12-31	12
1991-06-30	8
1991-12-31	6
1992-06-30	27
1992-12-31	5
1993-06-30	50
1993-12-31	35
1994-06-30	59
1994-12-31	39
1995-06-30	22
1995-12-31	56
1996-06-30	67
1996-12-31	291
1997-06-30	368
1997-12-31	140
1998-06-30	172
1998-12-31	178
1999-06-30	96