Bi-annual	US dollars
1987-06-30	302
1987-12-31	408
1988-06-30	447
1988-12-31	344
1989-06-30	526
1989-12-31	479
1990-06-30	1046
1990-12-31	949
1991-06-30	688
1991-12-31	607
1992-06-30	769
1992-12-31	957
1993-06-30	999
1993-12-31	1039
1994-06-30	2137
1994-12-31	3373
1995-06-30	3907
1995-12-31	4541
1996-06-30	4571
1996-12-31	611
1997-06-30	1293
1997-12-31	2071
1998-06-30	1799
1998-12-31	1401
1999-06-30	1290