Bi-annual	US dollars
1987-06-30	108
1987-12-31	140
1988-06-30	121
1988-12-31	96
1989-06-30	101
1989-12-31	148
1990-06-30	169
1990-12-31	131
1991-06-30	133
1991-12-31	159
1992-06-30	120
1992-12-31	80
1993-06-30	99
1993-12-31	108
1994-06-30	315
1994-12-31	110
1995-06-30	127
1995-12-31	144
1996-06-30	65
1996-12-31	118
1997-06-30	53
1997-12-31	100
1998-06-30	85
1998-12-31	73
1999-06-30	16