Bi-annual	US dollars
1987-06-30	18
1987-12-31	6
1988-06-30	5
1988-12-31	9
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	181
1992-12-31	127
1993-06-30	143
1993-12-31	149
1994-06-30	194
1994-12-31	341
1995-06-30	253
1995-12-31	278
1996-06-30	368
1996-12-31	276
1997-06-30	298
1997-12-31	276
1998-06-30	450
1998-12-31	616
1999-06-30	525