Bi-annual	US dollars
1987-06-30	16883
1987-12-31	17781
1988-06-30	17846
1988-12-31	15782
1989-06-30	15187
1989-12-31	16489
1990-06-30	16270
1990-12-31	16426
1991-06-30	13240
1991-12-31	14718
1992-06-30	13894
1992-12-31	13443
1993-06-30	28591
1993-12-31	27934
1994-06-30	30440
1994-12-31	28558
1995-06-30	31886
1995-12-31	36285
1996-06-30	36495
1996-12-31	39333
1997-06-30	41274
1997-12-31	40624
1998-06-30	40097
1998-12-31	36129
1999-06-30	33324