Bi-annual	US dollars
1987-06-30	666
1987-12-31	508
1988-06-30	926
1988-12-31	694
1989-06-30	561
1989-12-31	469
1990-06-30	534
1990-12-31	376
1991-06-30	326
1991-12-31	667
1992-06-30	925
1992-12-31	777
1993-06-30	1547
1993-12-31	1376
1994-06-30	1323
1994-12-31	1640
1995-06-30	1441
1995-12-31	1636
1996-06-30	1627
1996-12-31	1941
1997-06-30	1855
1997-12-31	1973
1998-06-30	1891
1998-12-31	1637
1999-06-30	1602