Bi-annual	US dollars
1987-06-30	44615
1987-12-31	42390
1988-06-30	39581
1988-12-31	40877
1989-06-30	39646
1989-12-31	44423
1990-06-30	44097
1990-12-31	45339
1991-06-30	43463
1991-12-31	46891
1992-06-30	49560
1992-12-31	45489
1993-06-30	62197
1993-12-31	63615
1994-06-30	67756
1994-12-31	83020
1995-06-30	90135
1995-12-31	93335
1996-06-30	108871
1996-12-31	125854
1997-06-30	128823
1997-12-31	159597
1998-06-30	178991
1998-12-31	164818
1999-06-30	163055