Bi-annual	US dollars
1987-06-30	435
1987-12-31	536
1988-06-30	498
1988-12-31	510
1989-06-30	414
1989-12-31	414
1990-06-30	296
1990-12-31	426
1991-06-30	342
1991-12-31	355
1992-06-30	350
1992-12-31	270
1993-06-30	345
1993-12-31	387
1994-06-30	458
1994-12-31	426
1995-06-30	375
1995-12-31	575
1996-06-30	525
1996-12-31	668
1997-06-30	654
1997-12-31	614
1998-06-30	667
1998-12-31	729
1999-06-30	686