Bi-annual	US dollars
1987-06-30	24
1987-12-31	19
1988-06-30	27
1988-12-31	34
1989-06-30	31
1989-12-31	27
1990-06-30	17
1990-12-31	15
1991-06-30	18
1991-12-31	24
1992-06-30	46
1992-12-31	30
1993-06-30	29
1993-12-31	21
1994-06-30	12
1994-12-31	8
1995-06-30	6
1995-12-31	16
1996-06-30	8
1996-12-31	75
1997-06-30	148
1997-12-31	16
1998-06-30	60
1998-12-31	95
1999-06-30	27