Bi-annual	US dollars
1987-06-30	537
1987-12-31	506
1988-06-30	406
1988-12-31	622
1989-06-30	592
1989-12-31	613
1990-06-30	562
1990-12-31	621
1991-06-30	514
1991-12-31	622
1992-06-30	611
1992-12-31	565
1993-06-30	500
1993-12-31	492
1994-06-30	352
1994-12-31	410
1995-06-30	398
1995-12-31	434
1996-06-30	236
1996-12-31	419
1997-06-30	359
1997-12-31	489
1998-06-30	479
1998-12-31	491
1999-06-30	481