Bi-annual	US dollars
1987-06-30	182
1987-12-31	125
1988-06-30	172
1988-12-31	318
1989-06-30	178
1989-12-31	164
1990-06-30	87
1990-12-31	237
1991-06-30	259
1991-12-31	269
1992-06-30	344
1992-12-31	386
1993-06-30	377
1993-12-31	421
1994-06-30	451
1994-12-31	455
1995-06-30	538
1995-12-31	523
1996-06-30	839
1996-12-31	835
1997-06-30	877
1997-12-31	798
1998-06-30	375
1998-12-31	368
1999-06-30	319