Bi-annual	US dollars
1987-06-30	348
1987-12-31	319
1988-06-30	309
1988-12-31	694
1989-06-30	712
1989-12-31	947
1990-06-30	392
1990-12-31	172
1991-06-30	204
1991-12-31	196
1992-06-30	183
1992-12-31	288
1993-06-30	437
1993-12-31	364
1994-06-30	403
1994-12-31	385
1995-06-30	313
1995-12-31	251
1996-06-30	259
1996-12-31	216
1997-06-30	589
1997-12-31	347
1998-06-30	290
1998-12-31	446
1999-06-30	568