Bi-annual	US dollars
1987-06-30	148
1987-12-31	117
1988-06-30	126
1988-12-31	110
1989-06-30	119
1989-12-31	76
1990-06-30	164
1990-12-31	123
1991-06-30	71
1991-12-31	56
1992-06-30	95
1992-12-31	136
1993-06-30	144
1993-12-31	152
1994-06-30	116
1994-12-31	116
1995-06-30	170
1995-12-31	87
1996-06-30	124
1996-12-31	142
1997-06-30	190
1997-12-31	240
1998-06-30	305
1998-12-31	250
1999-06-30	218