Bi-annual	US dollars
1987-06-30	260
1987-12-31	351
1988-06-30	263
1988-12-31	466
1989-06-30	234
1989-12-31	551
1990-06-30	410
1990-12-31	828
1991-06-30	1364
1991-12-31	1735
1992-06-30	1806
1992-12-31	1733
1993-06-30	2041
1993-12-31	1468
1994-06-30	1392
1994-12-31	1729
1995-06-30	1720
1995-12-31	1653
1996-06-30	1339
1996-12-31	1289
1997-06-30	1233
1997-12-31	1320
1998-06-30	1014
1998-12-31	948
1999-06-30	1244