Bi-annual	US dollars
1987-06-30	2
1987-12-31	0
1988-06-30	2
1988-12-31	16
1989-06-30	23
1989-12-31	34
1990-06-30	61
1990-12-31	56
1991-06-30	29
1991-12-31	43
1992-06-30	38
1992-12-31	-38
1993-06-30	66
1993-12-31	80
1994-06-30	51
1994-12-31	33
1995-06-30	38
1995-12-31	47
1996-06-30	37
1996-12-31	38
1997-06-30	30
1997-12-31	8
1998-06-30	78
1998-12-31	92
1999-06-30	57