Bi-annual	US dollars
1987-06-30	27027
1987-12-31	33738
1988-06-30	31809
1988-12-31	31879
1989-06-30	31410
1989-12-31	37242
1990-06-30	36453
1990-12-31	42140
1991-06-30	35744
1991-12-31	39388
1992-06-30	40561
1992-12-31	38243
1993-06-30	48465
1993-12-31	47487
1994-06-30	51784
1994-12-31	54837
1995-06-30	55782
1995-12-31	45280
1996-06-30	53878
1996-12-31	51501
1997-06-30	51686
1997-12-31	63675
1998-06-30	66854
1998-12-31	69452
1999-06-30	74573