Bi-annual	US dollars
1987-06-30	571
1987-12-31	500
1988-06-30	426
1988-12-31	389
1989-06-30	321
1989-12-31	274
1990-06-30	112
1990-12-31	110
1991-06-30	105
1991-12-31	71
1992-06-30	88
1992-12-31	35
1993-06-30	42
1993-12-31	39
1994-06-30	100
1994-12-31	102
1995-06-30	138
1995-12-31	119
1996-06-30	196
1996-12-31	248
1997-06-30	284
1997-12-31	255
1998-06-30	110
1998-12-31	77
1999-06-30	91