Bi-annual	US dollars
1987-06-30	3
1987-12-31	4
1988-06-30	7
1988-12-31	9
1989-06-30	11
1989-12-31	16
1990-06-30	21
1990-12-31	23
1991-06-30	29
1991-12-31	28
1992-06-30	49
1992-12-31	23
1993-06-30	42
1993-12-31	24
1994-06-30	14
1994-12-31	16
1995-06-30	21
1995-12-31	36
1996-06-30	34
1996-12-31	87
1997-06-30	145
1997-12-31	130
1998-06-30	57
1998-12-31	72
1999-06-30	47