Bi-annual	US dollars
1987-06-30	6
1987-12-31	8
1988-06-30	10
1988-12-31	9
1989-06-30	19
1989-12-31	15
1990-06-30	7
1990-12-31	6
1991-06-30	6
1991-12-31	7
1992-06-30	27
1992-12-31	36
1993-06-30	23
1993-12-31	56
1994-06-30	57
1994-12-31	53
1995-06-30	72
1995-12-31	60
1996-06-30	68
1996-12-31	96
1997-06-30	78
1997-12-31	114
1998-06-30	182
1998-12-31	223
1999-06-30	259