Bi-annual	US dollars
1987-06-30	32213
1987-12-31	37112
1988-06-30	35775
1988-12-31	37972
1989-06-30	42635
1989-12-31	38432
1990-06-30	39582
1990-12-31	39696
1991-06-30	39561
1991-12-31	39063
1992-06-30	39993
1992-12-31	41349
1993-06-30	46214
1993-12-31	40395
1994-06-30	41384
1994-12-31	45315
1995-06-30	54783
1995-12-31	41661
1996-06-30	38587
1996-12-31	64157
1997-06-30	102279
1997-12-31	107634
1998-06-30	107219
1998-12-31	69996
1999-06-30	84862