Bi-annual	US dollars
1987-06-30	11
1987-12-31	9
1988-06-30	10
1988-12-31	14
1989-06-30	12
1989-12-31	6
1990-06-30	9
1990-12-31	12
1991-06-30	5
1991-12-31	21
1992-06-30	36
1992-12-31	42
1993-06-30	44
1993-12-31	56
1994-06-30	71
1994-12-31	64
1995-06-30	84
1995-12-31	84
1996-06-30	95
1996-12-31	146
1997-06-30	190
1997-12-31	173
1998-06-30	153
1998-12-31	206
1999-06-30	148