Bi-annual	US dollars
1987-06-30	19
1987-12-31	26
1988-06-30	17
1988-12-31	24
1989-06-30	25
1989-12-31	16
1990-06-30	21
1990-12-31	29
1991-06-30	16
1991-12-31	19
1992-06-30	40
1992-12-31	23
1993-06-30	20
1993-12-31	15
1994-06-30	17
1994-12-31	13
1995-06-30	13
1995-12-31	14
1996-06-30	11
1996-12-31	14
1997-06-30	38
1997-12-31	0
1998-06-30	25
1998-12-31	50
1999-06-30	44