Bi-annual	US dollars
1987-06-30	250
1987-12-31	151
1988-06-30	135
1988-12-31	108
1989-06-30	79
1989-12-31	79
1990-06-30	52
1990-12-31	56
1991-06-30	36
1991-12-31	58
1992-06-30	61
1992-12-31	65
1993-06-30	57
1993-12-31	149
1994-06-30	133
1994-12-31	207
1995-06-30	242
1995-12-31	152
1996-06-30	168
1996-12-31	286
1997-06-30	193
1997-12-31	253
1998-06-30	202
1998-12-31	276
1999-06-30	136