Bi-annual	US dollars
1987-06-30	160
1987-12-31	104
1988-06-30	118
1988-12-31	112
1989-06-30	79
1989-12-31	84
1990-06-30	63
1990-12-31	44
1991-06-30	42
1991-12-31	37
1992-06-30	53
1992-12-31	53
1993-06-30	189
1993-12-31	189
1994-06-30	295
1994-12-31	329
1995-06-30	312
1995-12-31	363
1996-06-30	339
1996-12-31	178
1997-06-30	271
1997-12-31	306
1998-06-30	427
1998-12-31	394
1999-06-30	571