Bi-annual	US dollars
1987-06-30	106
1987-12-31	108
1988-06-30	148
1988-12-31	157
1989-06-30	143
1989-12-31	194
1990-06-30	199
1990-12-31	228
1991-06-30	92
1991-12-31	97
1992-06-30	89
1992-12-31	138
1993-06-30	162
1993-12-31	161
1994-06-30	221
1994-12-31	261
1995-06-30	122
1995-12-31	219
1996-06-30	200
1996-12-31	188
1997-06-30	198
1997-12-31	168
1998-06-30	160
1998-12-31	233
1999-06-30	77