Bi-annual	US dollars
1987-06-30	23
1987-12-31	15
1988-06-30	32
1988-12-31	9
1989-06-30	8
1989-12-31	11
1990-06-30	5
1990-12-31	2
1991-06-30	15
1991-12-31	19
1992-06-30	44
1992-12-31	55
1993-06-30	87
1993-12-31	78
1994-06-30	114
1994-12-31	102
1995-06-30	99
1995-12-31	178
1996-06-30	168
1996-12-31	193
1997-06-30	228
1997-12-31	260
1998-06-30	272
1998-12-31	238
1999-06-30	148