Bi-annual	US dollars
1987-06-30	3
1987-12-31	8
1988-06-30	5
1988-12-31	18
1989-06-30	12
1989-12-31	15
1990-06-30	16
1990-12-31	8
1991-06-30	11
1991-12-31	7
1992-06-30	8
1992-12-31	15
1993-06-30	14
1993-12-31	10
1994-06-30	15
1994-12-31	20
1995-06-30	22
1995-12-31	25
1996-06-30	40
1996-12-31	41
1997-06-30	55
1997-12-31	51
1998-06-30	20
1998-12-31	32
1999-06-30	24