Bi-annual	US dollars
1987-06-30	35
1987-12-31	143
1988-06-30	162
1988-12-31	202
1989-06-30	161
1989-12-31	134
1990-06-30	181
1990-12-31	139
1991-06-30	154
1991-12-31	176
1992-06-30	135
1992-12-31	167
1993-06-30	140
1993-12-31	124
1994-06-30	190
1994-12-31	210
1995-06-30	186
1995-12-31	216
1996-06-30	228
1996-12-31	339
1997-06-30	414
1997-12-31	380
1998-06-30	255
1998-12-31	393
1999-06-30	184