Bi-annual	US dollars
1987-06-30	321
1987-12-31	457
1988-06-30	469
1988-12-31	568
1989-06-30	550
1989-12-31	564
1990-06-30	506
1990-12-31	361
1991-06-30	366
1991-12-31	465
1992-06-30	1066
1992-12-31	954
1993-06-30	891
1993-12-31	840
1994-06-30	844
1994-12-31	493
1995-06-30	590
1995-12-31	614
1996-06-30	561
1996-12-31	606
1997-06-30	903
1997-12-31	448
1998-06-30	500
1998-12-31	537
1999-06-30	620