Bi-annual	US dollars
1987-06-30	339
1987-12-31	334
1988-06-30	288
1988-12-31	425
1989-06-30	270
1989-12-31	266
1990-06-30	335
1990-12-31	297
1991-06-30	233
1991-12-31	222
1992-06-30	226
1992-12-31	259
1993-06-30	269
1993-12-31	674
1994-06-30	309
1994-12-31	906
1995-06-30	547
1995-12-31	650
1996-06-30	429
1996-12-31	486
1997-06-30	466
1997-12-31	1043
1998-06-30	637
1998-12-31	1261
1999-06-30	683