Bi-annual	US dollars
1987-06-30	95
1987-12-31	98
1988-06-30	43
1988-12-31	47
1989-06-30	78
1989-12-31	61
1990-06-30	72
1990-12-31	64
1991-06-30	39
1991-12-31	47
1992-06-30	57
1992-12-31	21
1993-06-30	74
1993-12-31	145
1994-06-30	103
1994-12-31	100
1995-06-30	167
1995-12-31	237
1996-06-30	312
1996-12-31	27
1997-06-30	13
1997-12-31	107
1998-06-30	72
1998-12-31	-28
1999-06-30	183