Bi-annual	US dollars
1987-06-30	722
1987-12-31	919
1988-06-30	730
1988-12-31	1054
1989-06-30	643
1989-12-31	993
1990-06-30	998
1990-12-31	1202
1991-06-30	923
1991-12-31	1345
1992-06-30	537
1992-12-31	576
1993-06-30	618
1993-12-31	571
1994-06-30	790
1994-12-31	504
1995-06-30	875
1995-12-31	789
1996-06-30	741
1996-12-31	717
1997-06-30	845
1997-12-31	851
1998-06-30	857
1998-12-31	912
1999-06-30	948