Bi-annual	US dollars
1987-06-30	21
1987-12-31	94
1988-06-30	96
1988-12-31	116
1989-06-30	98
1989-12-31	103
1990-06-30	140
1990-12-31	104
1991-06-30	97
1991-12-31	97
1992-06-30	82
1992-12-31	82
1993-06-30	90
1993-12-31	106
1994-06-30	120
1994-12-31	156
1995-06-30	111
1995-12-31	129
1996-06-30	148
1996-12-31	187
1997-06-30	251
1997-12-31	220
1998-06-30	175
1998-12-31	238
1999-06-30	136