Bi-annual	US dollars
1987-06-30	71
1987-12-31	89
1988-06-30	43
1988-12-31	49
1989-06-30	81
1989-12-31	52
1990-06-30	89
1990-12-31	81
1991-06-30	55
1991-12-31	77
1992-06-30	82
1992-12-31	120
1993-06-30	158
1993-12-31	140
1994-06-30	113
1994-12-31	127
1995-06-30	169
1995-12-31	124
1996-06-30	138
1996-12-31	149
1997-06-30	140
1997-12-31	156
1998-06-30	130
1998-12-31	141
1999-06-30	147