Bi-annual	US dollars
1987-06-30	1035
1987-12-31	1355
1988-06-30	1516
1988-12-31	1242
1989-06-30	1398
1989-12-31	1577
1990-06-30	1992
1990-12-31	2059
1991-06-30	1570
1991-12-31	1707
1992-06-30	1532
1992-12-31	398
1993-06-30	362
1993-12-31	634
1994-06-30	1014
1994-12-31	1374
1995-06-30	1122
1995-12-31	1231
1996-06-30	1290
1996-12-31	1481
1997-06-30	1605
1997-12-31	1561
1998-06-30	1321
1998-12-31	1519
1999-06-30	1241