Bi-annual	US dollars
1987-06-30	161
1987-12-31	255
1988-06-30	229
1988-12-31	213
1989-06-30	453
1989-12-31	134
1990-06-30	429
1990-12-31	438
1991-06-30	285
1991-12-31	413
1992-06-30	354
1992-12-31	342
1993-06-30	495
1993-12-31	338
1994-06-30	363
1994-12-31	145
1995-06-30	205
1995-12-31	250
1996-06-30	376
1996-12-31	260
1997-06-30	-18
1997-12-31	107
1998-06-30	73
1998-12-31	-150
1999-06-30	159