Bi-annual	US dollars
1987-06-30	15
1987-12-31	13
1988-06-30	12
1988-12-31	16
1989-06-30	22
1989-12-31	29
1990-06-30	14
1990-12-31	33
1991-06-30	34
1991-12-31	35
1992-06-30	29
1992-12-31	42
1993-06-30	32
1993-12-31	31
1994-06-30	28
1994-12-31	33
1995-06-30	30
1995-12-31	34
1996-06-30	31
1996-12-31	29
1997-06-30	22
1997-12-31	25
1998-06-30	20
1998-12-31	18
1999-06-30	2