Bi-annual	US dollars
1987-06-30	887
1987-12-31	900
1988-06-30	783
1988-12-31	828
1989-06-30	767
1989-12-31	508
1990-06-30	474
1990-12-31	608
1991-06-30	504
1991-12-31	549
1992-06-30	537
1992-12-31	426
1993-06-30	464
1993-12-31	402
1994-06-30	404
1994-12-31	388
1995-06-30	507
1995-12-31	437
1996-06-30	522
1996-12-31	625
1997-06-30	476
1997-12-31	1099
1998-06-30	1012
1998-12-31	972
1999-06-30	804