Bi-annual	US dollars
1987-06-30	993
1987-12-31	1000
1988-06-30	1141
1988-12-31	1195
1989-06-30	1378
1989-12-31	1446
1990-06-30	1404
1990-12-31	1106
1991-06-30	1039
1991-12-31	1339
1992-06-30	1462
1992-12-31	1667
1993-06-30	1601
1993-12-31	797
1994-06-30	753
1994-12-31	393
1995-06-30	310
1995-12-31	309
1996-06-30	253
1996-12-31	171
1997-06-30	273
1997-12-31	169
1998-06-30	318
1998-12-31	251
1999-06-30	296