Bi-annual	US dollars
1987-06-30	16
1987-12-31	17
1988-06-30	22
1988-12-31	29
1989-06-30	43
1989-12-31	31
1990-06-30	23
1990-12-31	23
1991-06-30	24
1991-12-31	6
1992-06-30	10
1992-12-31	14
1993-06-30	17
1993-12-31	10
1994-06-30	8
1994-12-31	16
1995-06-30	16
1995-12-31	17
1996-06-30	9
1996-12-31	9
1997-06-30	15
1997-12-31	31
1998-06-30	12
1998-12-31	17
1999-06-30	24