Bi-annual	US dollars
1987-06-30	140
1987-12-31	174
1988-06-30	223
1988-12-31	278
1989-06-30	191
1989-12-31	176
1990-06-30	131
1990-12-31	127
1991-06-30	115
1991-12-31	106
1992-06-30	135
1992-12-31	103
1993-06-30	126
1993-12-31	108
1994-06-30	119
1994-12-31	105
1995-06-30	67
1995-12-31	57
1996-06-30	85
1996-12-31	188
1997-06-30	58
1997-12-31	161
1998-06-30	145
1998-12-31	106
1999-06-30	90