Bi-annual	US dollars
1987-06-30	10
1987-12-31	13
1988-06-30	10
1988-12-31	7
1989-06-30	6
1989-12-31	15
1990-06-30	3
1990-12-31	8
1991-06-30	6
1991-12-31	9
1992-06-30	4
1992-12-31	20
1993-06-30	18
1993-12-31	16
1994-06-30	22
1994-12-31	56
1995-06-30	51
1995-12-31	55
1996-06-30	20
1996-12-31	22
1997-06-30	27
1997-12-31	214
1998-06-30	125
1998-12-31	188
1999-06-30	148