Bi-annual	US dollars
1987-06-30	60
1987-12-31	153
1988-06-30	9
1988-12-31	20
1989-06-30	11
1989-12-31	16
1990-06-30	26
1990-12-31	58
1991-06-30	11
1991-12-31	19
1992-06-30	21
1992-12-31	8
1993-06-30	27
1993-12-31	10
1994-06-30	29
1994-12-31	48
1995-06-30	81
1995-12-31	43
1996-06-30	44
1996-12-31	75
1997-06-30	126
1997-12-31	148
1998-06-30	58
1998-12-31	67
1999-06-30	47