Bi-annual	US dollars
1987-06-30	16
1987-12-31	19
1988-06-30	29
1988-12-31	33
1989-06-30	19
1989-12-31	23
1990-06-30	28
1990-12-31	14
1991-06-30	10
1991-12-31	30
1992-06-30	25
1992-12-31	23
1993-06-30	24
1993-12-31	27
1994-06-30	26
1994-12-31	33
1995-06-30	19
1995-12-31	25
1996-06-30	50
1996-12-31	68
1997-06-30	78
1997-12-31	66
1998-06-30	62
1998-12-31	72
1999-06-30	44