Bi-annual	US dollars
1987-06-30	439
1987-12-31	474
1988-06-30	408
1988-12-31	447
1989-06-30	502
1989-12-31	589
1990-06-30	462
1990-12-31	486
1991-06-30	556
1991-12-31	753
1992-06-30	799
1992-12-31	795
1993-06-30	545
1993-12-31	256
1994-06-30	241
1994-12-31	178
1995-06-30	162
1995-12-31	129
1996-06-30	104
1996-12-31	43
1997-06-30	135
1997-12-31	44
1998-06-30	42
1998-12-31	50
1999-06-30	115