Bi-annual	US dollars
1987-06-30	189
1987-12-31	153
1988-06-30	280
1988-12-31	134
1989-06-30	234
1989-12-31	163
1990-06-30	235
1990-12-31	125
1991-06-30	196
1991-12-31	129
1992-06-30	299
1992-12-31	171
1993-06-30	81
1993-12-31	112
1994-06-30	32
1994-12-31	83
1995-06-30	130
1995-12-31	62
1996-06-30	166
1996-12-31	31
1997-06-30	273
1997-12-31	84
1998-06-30	282
1998-12-31	105
1999-06-30	175