Bi-annual	US dollars
1987-06-30	3
1987-12-31	4
1988-06-30	14
1988-12-31	13
1989-06-30	14
1989-12-31	15
1990-06-30	10
1990-12-31	6
1991-06-30	5
1991-12-31	15
1992-06-30	6
1992-12-31	8
1993-06-30	6
1993-12-31	6
1994-06-30	8
1994-12-31	19
1995-06-30	19
1995-12-31	20
1996-06-30	28
1996-12-31	15
1997-06-30	17
1997-12-31	21
1998-06-30	10
1998-12-31	15
1999-06-30	30