Bi-annual	US dollars
1987-06-30	158
1987-12-31	174
1988-06-30	153
1988-12-31	148
1989-06-30	85
1989-12-31	213
1990-06-30	218
1990-12-31	243
1991-06-30	107
1991-12-31	80
1992-06-30	48
1992-12-31	14
1993-06-30	9
1993-12-31	0
1994-06-30	0
1994-12-31	0
1995-06-30	8
1995-12-31	0
1996-06-30	0
1996-12-31	0
1997-06-30	0
1997-12-31	0
1998-06-30	2
1998-12-31	0
1999-06-30	0