Bi-annual	US dollars
1987-06-30	490
1987-12-31	1119
1988-06-30	877
1988-12-31	835
1989-06-30	674
1989-12-31	956
1990-06-30	516
1990-12-31	542
1991-06-30	263
1991-12-31	616
1992-06-30	324
1992-12-31	392
1993-06-30	1253
1993-12-31	941
1994-06-30	940
1994-12-31	2231
1995-06-30	934
1995-12-31	1817
1996-06-30	1263
1996-12-31	1496
1997-06-30	1286
1997-12-31	304
1998-06-30	1697
1998-12-31	504
1999-06-30	885