Bi-annual	US dollars
1987-06-30	700
1987-12-31	736
1988-06-30	779
1988-12-31	756
1989-06-30	794
1989-12-31	718
1990-06-30	710
1990-12-31	805
1991-06-30	832
1991-12-31	947
1992-06-30	946
1992-12-31	939
1993-06-30	983
1993-12-31	814
1994-06-30	715
1994-12-31	715
1995-06-30	654
1995-12-31	653
1996-06-30	618
1996-12-31	582
1997-06-30	477
1997-12-31	475
1998-06-30	535
1998-12-31	411
1999-06-30	624