Bi-annual	US dollars
1987-06-30	950
1987-12-31	708
1988-06-30	616
1988-12-31	1251
1989-06-30	1547
1989-12-31	1440
1990-06-30	1282
1990-12-31	637
1991-06-30	464
1991-12-31	551
1992-06-30	875
1992-12-31	373
1993-06-30	395
1993-12-31	390
1994-06-30	605
1994-12-31	421
1995-06-30	488
1995-12-31	533
1996-06-30	508
1996-12-31	560
1997-06-30	650
1997-12-31	615
1998-06-30	1464
1998-12-31	1682
1999-06-30	1537