Bi-annual	US dollars
1987-06-30	542
1987-12-31	468
1988-06-30	655
1988-12-31	792
1989-06-30	619
1989-12-31	847
1990-06-30	708
1990-12-31	843
1991-06-30	712
1991-12-31	788
1992-06-30	643
1992-12-31	297
1993-06-30	296
1993-12-31	306
1994-06-30	275
1994-12-31	177
1995-06-30	277
1995-12-31	285
1996-06-30	446
1996-12-31	442
1997-06-30	506
1997-12-31	602
1998-06-30	534
1998-12-31	439
1999-06-30	481