Bi-annual	US dollars
1987-06-30	111
1987-12-31	89
1988-06-30	51
1988-12-31	112
1989-06-30	74
1989-12-31	101
1990-06-30	77
1990-12-31	54
1991-06-30	58
1991-12-31	86
1992-06-30	72
1992-12-31	47
1993-06-30	133
1993-12-31	144
1994-06-30	151
1994-12-31	183
1995-06-30	266
1995-12-31	246
1996-06-30	295
1996-12-31	303
1997-06-30	169
1997-12-31	222
1998-06-30	250
1998-12-31	329
1999-06-30	298