Bi-annual	US dollars
1987-06-30	289
1987-12-31	277
1988-06-30	263
1988-12-31	278
1989-06-30	251
1989-12-31	197
1990-06-30	206
1990-12-31	189
1991-06-30	180
1991-12-31	144
1992-06-30	131
1992-12-31	95
1993-06-30	68
1993-12-31	38
1994-06-30	68
1994-12-31	11
1995-06-30	40
1995-12-31	138
1996-06-30	132
1996-12-31	144
1997-06-30	165
1997-12-31	171
1998-06-30	168
1998-12-31	156
1999-06-30	139