Bi-annual	US dollars
1987-06-30	18
1987-12-31	19
1988-06-30	20
1988-12-31	20
1989-06-30	19
1989-12-31	18
1990-06-30	17
1990-12-31	17
1991-06-30	15
1991-12-31	21
1992-06-30	21
1992-12-31	21
1993-06-30	26
1993-12-31	24
1994-06-30	29
1994-12-31	42
1995-06-30	46
1995-12-31	50
1996-06-30	51
1996-12-31	53
1997-06-30	96
1997-12-31	64
1998-06-30	83
1998-12-31	58
1999-06-30	60