Bi-annual	US dollars
1987-06-30	23
1987-12-31	28
1988-06-30	29
1988-12-31	34
1989-06-30	31
1989-12-31	32
1990-06-30	19
1990-12-31	10
1991-06-30	13
1991-12-31	24
1992-06-30	86
1992-12-31	79
1993-06-30	77
1993-12-31	87
1994-06-30	60
1994-12-31	13
1995-06-30	17
1995-12-31	31
1996-06-30	31
1996-12-31	29
1997-06-30	47
1997-12-31	39
1998-06-30	52
1998-12-31	20
1999-06-30	16