Bi-annual	US dollars
1987-06-30	85
1987-12-31	83
1988-06-30	67
1988-12-31	49
1989-06-30	40
1989-12-31	56
1990-06-30	24
1990-12-31	46
1991-06-30	32
1991-12-31	86
1992-06-30	80
1992-12-31	39
1993-06-30	234
1993-12-31	139
1994-06-30	139
1994-12-31	102
1995-06-30	87
1995-12-31	191
1996-06-30	2
1996-12-31	-2
1997-06-30	110
1997-12-31	128
1998-06-30	564
1998-12-31	604
1999-06-30	662