Bi-annual	US dollars
1987-06-30	18
1987-12-31	17
1988-06-30	7
1988-12-31	0
1989-06-30	5
1989-12-31	5
1990-06-30	2
1990-12-31	2
1991-06-30	3
1991-12-31	6
1992-06-30	6
1992-12-31	5
1993-06-30	0
1993-12-31	18
1994-06-30	48
1994-12-31	72
1995-06-30	87
1995-12-31	140
1996-06-30	131
1996-12-31	192
1997-06-30	231
1997-12-31	252
1998-06-30	255
1998-12-31	176
1999-06-30	177