Bi-annual	US dollars
1987-06-30	18
1987-12-31	8
1988-06-30	7
1988-12-31	13
1989-06-30	65
1989-12-31	13
1990-06-30	72
1990-12-31	137
1991-06-30	68
1991-12-31	80
1992-06-30	183
1992-12-31	129
1993-06-30	144
1993-12-31	151
1994-06-30	198
1994-12-31	349
1995-06-30	256
1995-12-31	279
1996-06-30	370
1996-12-31	276
1997-06-30	298
1997-12-31	283
1998-06-30	452
1998-12-31	616
1999-06-30	527